102results about How to "With ventilation function" patented technology

A ceiling embedded type intelligent kitchen air conditioner comprises a mounting frame, a panel and an air conditioner component. The mounting frame is located in the kitchen ceiling, the panel is located below the mounting frame, a sealed cavity is formed between the mounting frame and the panel, a partition is arranged in the middle of the sealed cavity, the sealed cavity on one side of the partition is of an outer cavity unit, and the sealed cavity on the other side of the partition is of an inner cavity unit; the outer cavity unit is provided with an outdoor air inlet and an outdoor air outlet which are communicated with the air outside the wall of the kitchen, and the inner cavity unit is provided with an indoor air inlet and an indoor air outlet which are communicated with the air inside the wall of the kitchen; the air conditioner component comprises a micro compressor, a condenser, a condenser fan, an evaporator and an evaporator fan; the indoor air inlet is provided with a lifting mechanism, and the action end of the lifting mechanism is provided with a fume filtering device, in the high level state, located in the indoor air inlet. The air conditioner has the fume filtering function and is convenient to mount.

To provide a small blowing device of high reliability, simple in constitution and capable of switching to air supply and exhaust. The blowing device 20 is provided with a blower section 50 and an air course switching device 40 for switching to an air course for supplying outdoor air into a room, and to an air course for exhausting indoor air to the outdoors. The blower section 50 is provided with a centrifugal blower 33 for sucking air from an axial direction and blowing off air in a circumferential direction, a suction chamber 31 formed larger than a suction port of the blower 33, and a blowoff chamber 32 formed on the blowoff side of the blower 33. The air course switching device 40 is provided with an outer shell 46 having a plurality of openings, an air course switching body 41 turnably arranged in the outer shell 46 and having a partition wall for dividing the inside into a plurality of air courses, and a driving device 47 for turning the air course switching body 41 to switch communication between the plurality of air courses of the air course switching body 41 and the plurality of openings of the outer shell 46. The air course switching device 47 is juxtaposed to overlap the suction chamber 31 of the blower section 50.

The invention relates to a household planting shed which comprises a multilayer three-dimension type cultivating bed. The multilayer three-dimension type cultivating bed is placed inside a house framework, a plastic film is covered on the house framework to form a small vinyl house, and a small door is formed in one side of the house framework. The multilayer three-dimension type cultivating bed comprises a left support and a right support, a plurality of layers of seedling supports are arranged between the left support and the right support from bottom to top, the widths of the plurality of the layers of the seedling supports gradually decrease from bottom to top, wherein seedling supports at a bottom layer and at a top layer are fixed on the left support and the right support. Seedling supports at a middle layer are arranged on the left support and the right support in a pivot joint mode, rotate around a pivot, and simultaneously rotate by a connecting rod. The household planting shed is quite suitable for being used by an urban family on a balcony, a roof or a space at front and rear of a house. People not only can experience farming pleasure and achieve the aim of exercising a physical body, but also can eat fresh and safe vegetables. The household planting shed serves multiple purposes.

The invention provides a breathable cushion which comprises a top layer, a bottom layer, a movable supporting structure, springs and an air bag structures. When the breathable cushion is used, a user only needs to shake the cushion, the springs and the air bag structures in the cushion can be switched between a compressed state and a relaxed state, namely air can flow near the top layer of the cushion, and the breathability of the cushion is effectively improved. The breathable cushion is suitable for various sofa seats, automobile chairs and backrest cushions.

The invention relates to a non-pillar sublevel caving mining method for discharging ores from a side part of an electric rake roadway. The method comprises the following steps: dividing an ore body into phases, and dividing each phase into segments; arranging segmented accesses in a rhombic staggered manner; excavating a way shaft and an ore chute from a foot-wall phase haulage way to an upper phase foot-wall haulage way along one end of an ore block; then, initially excavating a segmented connection roadway in a first segment of the current phase. The method is characterized in that the rhombic staggered arrangement refers to an arrangement manner of recovering accesses among segments; after the excavation of recovering accesses of the current segment is completed, an electric rake roadway is excavated between the two recovering accesses of the segment and parallel to the recovering accesses; ore crosscuts are excavated at certain intervals between the recovering accesses and the electric rake roadway; a hanging-wall exhausting roadway communicated with the electric rake roadway is excavated from the inner end of the electric rake roadway to the outer side of a mineral vein. Compared with the traditional non-pillar sublevel caving mining method, the non-pillar sublevel caving mining method, provided by the invention, has the advantages of high safety, low cost, good blasting effect, and high rock-drilling efficiency.

The invention provides an image collecting device for traditional Chinese medicine face diagnosis. The device comprises a face diagnosis camera obscura, a light source system and a driving circuit system. The side face of a face diagnosis camera obscura body is provided with a face information collecting window, an infrared video camera, a digital camera and the light source system are installed inside the face diagnosis camera obscura body, and an infrared camera is installed between the face window and the light source system and is responsible for collection of face infrared imaging; the digital camera is right opposite to the face information collecting widow and responsible for collection of patient face image information; the driving circuit system comprises a computer, a displayer, USB interfaces, a power supply module and a control circuit. The infrared camera and the digital camera are connected with the computer through the USB interfaces, and the control circuit can control switches of the infrared camera, the digital camera, the light source and a fan. According to the image collecting device, face images in a standard light environment can be obtained, face infrared imaging can be achieved, clinical diagnosis of traditional Chinese medicine science is assisted, and the efficiency and accuracy of traditional Chinese medicine face diagnosis information discrimination are improved.

The invention relates to an internal heat exchange type material pyrophorisity test device with a cutting knife safety control component. The internal heat exchange type material pyrophorisity test device comprises a box body, a temperature control component, the safety control component and a feedback control component. Compared with the prior art, the internal heat exchange type material pyrophorisity test device has the advantages that the temperature control component, the safety control component and the feedback control component are organically combined together through a modularization concept, so that fed gas is heated by afterheat of exhausted gas through the temperature control component consisting of a heat exchanger and a heating stick, and the energy consumption amount can be effectively reduced; the safety control component can protect an experimenter and equipment under emergency conditions of sample combustion, explosion and the like; automatic control can be realized through the feedback control component and a relevant sensor. By virtue of the compact modularized structural design, the internal heat exchange type material pyrophorisity test device solves the problem that most of the conventional baking ovens are not suitable for the test on the material pyrophorisity, can realize energy conservation, explosion prevention and pollution prevention, has a ventilating function and is convenient to operate and maintain.

The invention belongs to a fresh air humidifying unit and particularly relates to a single-cooling heat source fresh air humidifying unit. The unit comprises an indoor unit and an outdoor unit. The indoor unit comprises an air inlet, a filter screen assembly, an evaporator, a reheat condenser, a humidifier, a fan and an air outlet which are arranged in sequence. The outdoor unit comprises a four-way valve, a compressor, a condenser and an outdoor expansion valve, wherein the compressor, the condenser, the outdoor expansion valve and the evaporator form a loop. The evaporator, the compressor and the condenser are connected with the four-way valve, the condenser is provided with a radiator, the reheat condenser and the condenser are in parallel connection through a pipe, and the pipe, closeto the evaporator, of the reheat condenser is provided with a reheat expansion valve. According to the single-cooling heat source fresh air humidifying unit, a single-cooling heat source is adopted for treating air, the heating temperature of the reheat condenser is controlled just by adjusting the flow proportion of the reheat expansion valve to a main expansion valve, electrodeless adjustment can be achieved, and the adjustment process is simple and flexible.

The present invention discloses an automatic dismounting line of power battery and a dismounting method thereof. The automatic dismounting line comprises an intelligent stock bin, a housing annular cutting device, a pole head cutting device, a coring device, a manipulator and a control cabinet. The intelligent stock bin, the housing annular cutting device, the pole head cutting device and the coring device are put in order in a clockwise direction in a horizontal plane and form a middle space, and the manipulator is located at the middle space. A dismounting platform is employed to research and develop the automatic production of processes such as power battery dismounting and core separation for automatic demands of the harmless dismounting of the power battery monomers and separation ofthe core pack and the housing in a certain dimension range.

The invention discloses a multifunctional experimental mouse operating device, comprising a cuboid-shaped box and a top cover, wherein one end surface of the cuboid-shaped box is an opening surface, and the other end surface is a blind end and is provided with a round tube communicating the inside and outside of the box; the bottom surface of the box, near the opening surface, is provided with a notch; the top surface of the box is semi-closed; and the top cover is movably connected with the box and can open or close the box. According to a multifunctional experimental mouse operating method disclosed by the invention, the multifunctional experimental mouse operating device is used, intraperitoneal injection, intraperitoneal anesthesia, atomizing operation, caudal vein blood sampling and tail fixation of an experimental mouse can be finished in the box in a closed state, the fixation and trachea medication of the experimental mouse can be finished in the box in an open state, and every operation can be finished by one person, so that the operation is simple, the experimental process is greatly simplified, and manpower is saved.

The invention belongs to a ventilation humidity regulating unit, and particularly relates to a series single cold and heat source ventilation humidity regulating unit. The ventilation humidity regulating unit comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises an air inlet, a filter screen assembly, an evaporator, a reheat condenser, a humidifier, a fan and an air outlet which are arranged in sequence; and the outdoor unit comprises a four-way valve, a compressor, a condenser and an outdoor expansion valve, wherein the compressor, the condenser and the outdoor expansion valve form a loop with the evaporator, the evaporator, the compressor and the condenser are connected with the four-way valve, a radiator is arranged on the condenser, the reheat condenser is arranged between the condenser and the evaporator in series through a pipeline, and a reheat expansion valve is arranged on the pipeline where the reheat condenser is located in parallel. According to the series single cold and heat source ventilation humidity regulating unit, a single cold and heat source is adopted to process air, the heating temperature of the reheat condenser is controlled by regulating the flow of the reheat expansion valve, stepless regulation can be realized, the regulation process is simple and flexible, and the indoor unit and the outdoor unit are connected through two pipelines, so that the installation and connection difficulty is reduced.

The present invention provides a tubular solid oxide fuel cell sealing material, a tubular solid oxide fuel cell stack, and preparation methods of the tubular solid oxide fuel cell sealing material and the tubular solid oxide fuel cell stack. The sealing material comprises an electric conduction layer, a sealing layer and a bonding layer, wherein the electric conduction layer is a metal pipe or a composite anode support pipe, a SrxA1-xTiyB1-yO3 base sealing layer is coated on the outer side of the electric conduction layer, A is selected from La and Y, B is one selected from Fe, Co, Ni, Cu and Zn, x is 0.5-1, y is 0.5-1, the bonding layer is coated on the outer side of the sealing layer, and the bonding layer is a LaCrO3 base connection material. According to the present invention, the tubular solid oxide fuel cell sealing material is adopted to connect with the adjacent single cells to form the cell stack; the sealing material has the three-layer structure comprising the electric conduction layer, the sealing layer and the bonding layer, integrates the connection material and the sealing material, and concurrently has functions of gas ventilation and electric conduction; and the research on the tubular bidirectional function composite sealing material system concurrently having functions of gas ventilation and electric conduction is achieved.

The invention discloses a computer case with line arrangement and storage functions. The case comprises a case body and a storage box which is arranged on the side surface of the case body, the storage box comprises a storage box body, a multi-hole cover plate and a sealing cover, and a vent hole is formed in the side surface, connected with the case body, in the storage box body; an exhaust fan is arranged in the vent hole, multiple line arrangement components are further arranged on the side surface, connected with the case body, in the storage box body, and the line arrangement components surround the exhaust fan. The computer case has the line arrangement and storage functions at the same time, the positions of the line arrangement components are adjusted according to the lengths of apower cord and a cable, the winding turn number is reduced, the power cord, the cable and the like can be stored, and interlacing and knotting among different lines are also reduced.

The invention discloses an air drier and a method. The air drier comprises a shell and an inner bladder, wherein a closed cavity is formed between the shell and the inner bladder, a drying agent is filled in the inner bladder, the inner bladder is provided with an air inlet, an air outlet and an exhaust port, and the air outlet is respectively communicated with the exterior of the shell and the cavity. According to the method, the air drier can be used for drying compressed air and can realize regeneration of the drying agent. The air drier has a simple structure, is convenient to maintain, occupies a small space, and can meet actual demands on drying of the compressed air.

Disclosed is an in-vein filling mining method. According to the in-vein filling mining method, stoping and filling are carried out in V-shaped ore chambers formed in cutting grooves of all layers, andan out-of-vein filling mining method and a traditional in-vein filling mining method are combined, so that in-vein gate ways have the transporting and filling functions, the ventilation function is achieved during in-vein cutting, simultaneous stoping of the multiple ore chambers can further be achieved, and thus the productivity problem of end retreating mining is solved; meanwhile, when the V-shaped ore chambers are stoped, the productivity of the multiple ore chambers can be released simultaneously; finally, inverted-V-shaped intervening pillars are recovered so that interval layered stoping can be conducted, namely simultaneous stoping is conducted from the lowest layer of a panel according to of the first layer, the third layer, the fifth layer..., and finally the second layer, the fourth layer and sixth layer...are recovered; and therefore, the current situation that through a traditional end retreating mining method, the productivity of the panel is excessively low is changed greatly, and the ore recovery rate is further increased.

The invention discloses an air conditioner with air-changing function, which comprises the following parts: air-out channel for discharging the indoor air outdoors, air-changing unit of sensible heat converter for heat conversion in the air-supply and air-out intercourse, refrigeration circulation air conditioner unit with evaporation heat converter on the air-supply channel, wherein the air conditioner unit contains inner circulation channel for inflowing the indoor air of evaporation heat converter; the air-changing unit contains simple air-changing channel to discharge the air outdoors directly without flowing through the sensible heat converter.

The invention relates to an air-floating roller bed type thermal treatment furnace for semiconductor devices. The heat-treatment furnace is characterized in that a roller bed for transferring the semiconductor devices comprises a plurality of horizontally-arranged roll shafts capable of reciprocating along self axial lines, at least part of the roll shafts are hollow, a plurality of breathing holes are formed in the parts, where the semiconductor devices pass, of the hollow roll shafts in the radial direction, at least one end of each hollow roll shaft is connected with one air inlet pipe through a rotary joint, and air enters furnace chamber parts where the semiconductor devices pass through the breathing holes in the hollow roll shafts. According to the thermal treatment furnace provided by the invention, the atmosphere and the cleanliness of a center diffusion zone in the furnace are fundamentally ensured, so that the diffusion effect and the quality are improved.

The invention provides a wind power generator set. The wind power generator set includes a bearing system, a fixing shaft and a hub, wherein the bearing system includes an outer bearing ring and an inner bearing ring; the fixing shaft is connected with the inner bearing ring; and the hub is connected with the outer bearing ring. The wind power generator set is characterized in that the wind powergenerator set further comprises an air cooling system; the air cooling system includes an air outlet pipeline; the air outlet pipeline is located in the radial direction of the inner bearing ring; andthe air outlet pipeline can be rotatable around the center point position of the inner bearing ring. Air pipelines are used in the wind power generator set to circumferentially eject inner bearing rings by 360 degrees; bearing temperature and circumferential temperature gradient are effectively controlled; coolant is not needed; the process is simple; because the air is sucked from the outside, abearing is cooled while the inner cavity of the hub generates air convection; heat dissipation is enhanced; the abnormal operation of the internal electrical equipment due to excessive temperature isavoided; and at the same time, the wind power generator set also features cabin ventilation to save an additional cabin ventilation device.

The invention provides an intelligent distribution system comprising an intelligent distribution box and an intelligent mobile terminal. Intelligent distribution software is installed on a control system board of the intelligent distribution box. Intelligent control software is installed on the intelligent mobile terminal. The intelligent control software and the intelligent distribution box are connected through WiFi or a wired network. The intelligent distribution system has beneficial effects of being simple in structure, acquiring the electricity using state of each branch, achieving network electricity charge payment; individually setting an electricity using scheme, namely an electricity using scheme and a control scheme of one or more combined terminals; decreasing the number of switches and wires; reducing reactive loss; saving energy; setting staggered electricity using; acquiring and analyzing the states of all terminals; and achieving a ventilation function, a waterproof function, a positioning function, a wireless connection function, a payment function, and a statistic and data analysis function.

The invention relates to an anti-seepage water storage blanket for sandy soil planting and a preparation method of the blanket. The anti-seepage water storage blanket is composed of an anti-seepage water storage layer and surface film layers arranged on the upper surface and the lower surface of the anti-seepage water storage layer; each surface film layer is made of breathable fabric film cloth,and the thickness of the anti-seepage water storage layer is 0.5-2 cm; the anti-seepage water storage layer is prepared from a mixture formed by mixing super-hydrophobic particles and a degradable flexible adhesive. Compared with the prior art, the problems that in the ecological planting process in a drought area, an anti-seepage material is difficult to construct, paving is uneven, an anti-seepage water storage layer is easy to damage, and water is likely to leak are solved. The anti-seepage water storage blanket remarkably improves the stability of the anti-seepage water storage layer, water leakage can be effectively prevented, the construction process is simple, and the anti-seepage water storage blanket has very wide application prospects.

The invention discloses a heat exchanger assembly. The heat exchanger assembly comprises copper pipes, water inlet and outlet ends, cooling fins and outline cooling fins; the water inlet and outlet ends are connected with the copper pipes; the cooling fins and outline cooling fins are all provided with copper pipe penetrating holes; the cross sections of the outline cooling fins are in a continuously-folded quasi-square wave or triangular shape, corners of the quasi-square wave or triangular shape have uniform side protrusions when keeping the outer plane of the quasi-square wave or triangular shape to be a horizontal plane, the adjacent side protrusions make contact with each other, or a narrow slit is reserved between the adjacent side protrusions; the cooling fins are uniformly distributed in the outline cooling fins; the thickness of the outline cooling fins is 0.35-1.5 mm; the outer plane of the quasi-square wave or triangular shape of the outline cooling fins serves as the outer plane of a radiator at the same time; and the cooling fins are arranged in the quasi-square wave or triangular outline of the outline cooling fins.

The invention discloses an engineering machinery seat and engineering machinery, and relates to a seat technology. The engineering machinery seat comprises a manifold and a seat air outlet, wherein an air inlet end of the manifold is connected with an air conditioning evaporator; a first branch of the manifold is connected with a foot part air outlet; a second branch of the manifold is connected with the seat air outlet; and on-off switching of the first branch and the second branch of the manifold is performed through a switching component. The technical scheme has the beneficial effects that the seat has a ventilation function and can be used for ventilation of a seat cushion and a backrest and the ventilation air volume can be adjusted. By arranging a soft telescopic air duct at a position of the seat where movement is required and the angle is required to be changed, the problems of difficulty in arrangement of a seat air duct with a ventilation function and influence on the integral structure after arrangement are solved; the engineering machinery seat with the ventilation function can be realized at low cost; the comfort of a cab is integrally improved; and the working efficiency of a driver is increased.

The invention discloses a nursing apparatus. The nursing apparatus is characterized by comprising a buffer carrier, a pneumatic feces remover, a urine pot and an air pump. The buffer carrier is disposed in the upper layer of the nursing apparatus and comprises a nonwoven layer, a buffer layer and a plastic layer from top to bottom. The invention further provides a nursing pad comprising the nursing apparatus. The nursing pad further comprises a pad body; the pad body is internally provided with at least two airbags arranged in parallel; the airbags are connected with the air pump. The nursing apparatus is scientific and reasonable and convenient to use; the nursing apparatus is controlled through a wire or remotely; the nursing apparatus has the functions such as automatic removal of feces and urine, ventilation, automatic nursing, cleaning and semi-reclining.

The invention discloses a novel integrated bathroom master heating device. The novel integrated bathroom master heating device comprises a base, wherein a motor is arranged at the right side of an inner cavity of the base; an output end of the motor is fixedly connected to a rotating shaft; a turntable is arranged at the right side of the rotating shaft in a sleeving manner; the surface of the turntable is movably connected to a connecting rod; the left side of the connecting rod is movably connected to a fixed block; the left side of the fixed block is fixedly connected to a sliding rod; andthe top of the sliding rod is fixedly connected to a sliding block. Through the cooperative use of the base, the motor, the rotating shaft, the turntable, the connecting rod, a sliding chute, the sliding block, the sliding rod, the fixed block, a supporting block, a fixed link, a fan, a bathroom master lampshade, an air outlet, a bathroom master lamp, a temperature sensor, a conducting wire, an air inlet and a motor control switch, the novel integrated bathroom master heating device solves the problem that when the existing bathroom master is in use, as the existing bathroom master does not have an air exchange function, the existing bathroom master causes certain damage to a human body if the temperature is too high or too low; and the novel integrated bathroom master heating device is convenient to use by users; and the practicability of the bathroom master is improved.

The invention discloses an prefabricated container house which comprises a box body and a roof which are detachably connected; a door and a window are arranged on the box body; the prefabricated container house is characterized in that the box body is defined by assembling a plurality of horizontal wallboards and right-angle wallboards; grooves are formed in the two sides of the horizontal wallboards and the two sides of the right-angle wallboards; a plurality of hook parts are arranged in the grooves; the bending directions of the hook parts at the left sides and the right sides of the horizontal wallboards are opposite; and a plurality of partition plates capable of partitioning the box body are detachably arranged in the box body. The prefabricated container house is convenient to assemble and transport, capable of achieving automatic back locking, good in anti-theft performance, capable of being partitioned into multiple spaces, capable of being powered by solar energy and good insound insulation effect, the roof has the ventilation function, the structural stability is better, and rainwater backflow can be prevented.

The invention relates to a greenhouse with a ventilating function. The greenhouse comprises a wall body. A ceiling is arranged at the upper end of the wall body. A ventilating device is arranged on the wall body, and comprises a window plate arranged on the wall body. A vent hole is formed in the wall body and runs through the wall body. The lower side of the window plate is hinged to the lower edge of the vent hole. The outer edge of the window plate and the inner wall of the vent hole are each provided with a sealing elastic layer. Louver blades are arranged in the vent hole and provided with grids. A power channel is arranged in the vent hole. A motor and a fixing frame for fixing the motor are arranged in the power channel. An impeller is arranged at the output end of the motor. A filtering channel is connected with the power channel. A coarse filter screen and a fine filter screen are sequentially arranged on the filtering channel from outside to inside. A silent plate wraps the outer surface of the filtering channel. A flame-retardant plate wraps the outer surface of the silent plate. The greenhouse of the structure has a high ventilation property and high safety.

The invention belongs to the technical field of smart home, and particularly relates to a smart bed adjusting device. A bedridden patient needs to be carefully nursed to avoid the occurrence of pressure ulcers, muscle atrophy and the like, and an existing smart bed cannot regulate the local contact pressure, temperature or gas of the human body. The smart bed adjusting device comprises a control unit and a running unit; the control unit comprises a controller, and the controller is connected with a temperature detection sensor, an oxygen content detection sensor and a humidity detection sensor; the running unit comprises a lifting assembly and a temperature control ventilation assembly; the lifting assembly comprises a gear shifting mechanism, and the gear shifting mechanism is connected with the controller and a lifting mechanism; the temperature control ventilation assembly comprises a ventilation heating mechanism, and the ventilation heating mechanism is connected with the gear shifting mechanism and the controller. The smart bed adjusting device is complete in function and compact in structure, and the height adjustment and ventilation heating functions on a sleeping bed can be simultaneously achieved.

The invention discloses a document management device, and belongs to the field of the document cabinet. The document management device comprises a rectangular document cabinet body; a shock-absorbinguniversal wheel device is arranged at the bottom of the document cabinet body; a first storage cabinet, an infrared intelligent propulsion drawer and a second storage cabinet are orderly arranged in the document cabinet body from top to bottom; a controller is arranged on one side of the document cabinet body, and the controller is electrically connected with each of a ventilating device, an infrared intelligent propulsion device and a dust-removal air-extracting device. The document management device has the advantages of being simple in structure and strong in practicability.

The invention relates to a ventilation and escape structure for an underground pipe gallery, which belongs to the technical field of underground buildings, and includes an underground pipe gallery wall, an inspection cabin, an explosion-proof layer, an inspection lane, an inspection vehicle, an electric rising floor, a high-strength steel strand, and a crane port. Ventilation cabin, large exhaust ventilator, steel bracket, etc. The underground pipe gallery is divided into upper, middle and lower floors. There is an inspection cabin in the middle of the upper floor, ventilation cabins are installed on the left and right sides, and an explosion-proof layer is installed on the inner wall of the inspection cabin. For the driveway, a crane port is set in each safety section, and a cover plate is provided above the crane port, and an electric rising floor is installed at the corresponding place below each crane port, and high-strength steel strands are used to connect with the crane port, and the maintenance lane at the electric rising floor and its It is connected as a whole and can be separated and disassembled from other parts of the maintenance lane. The invention has the advantages of combining the functions of ventilation and escape, meeting the safety requirements, and at the same time reducing the engineering cost to the greatest extent, and has strong practicability.