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A commercial refrigeration compressor motor mutual inductance type noncontact current starter comprising a box body, a starting control mechanism, a zero-power-consumption starting mechanism, a box body cover, an external terminal mechanism and a plug pin mechanism, wherein a starting control mechanism cavity and a zero-power-consumption starting mechanism cavity are arranged in the box body, the starting control mechanism is arranged in the starting control mechanism cavity, the zero-power-consumption starting mechanism is arranged in the zero-power-consumption starting mechanism cavity, an inner part of the box body cover is provided with relief holes for a plug pin M and a plug pin N and external electrode slice plug pin relief holes, the external terminal mechanism is arranged at one side of the box body cover, and the plug pin mechanism comprises the plug pins M and N. The commercial refrigeration compressor motor mutual inductance type noncontact current starter is characterized in that the starting control mechanism cavity is separated from the zero-power-consumption starting mechanism cavity via an insulating separation wall; the starting control mechanism cavity comprises a current transformer cavity, a bidirectional silicon controlled rectifier cavity and an electric inductor cavity; the zero-power-consumption starting mechanism cavity comprises first and second PTC cavities; the starting control mechanism comprises a current transformer, a bidirectional silicon controlled rectifier and an electric inductor; the zero-power-consumption starting mechanism comprises first and second PTCs, internal and external electrode slices and electrode slice resistors. The commercial refrigeration compressor motor mutual inductance type noncontact current starter is safe and reliable, energy can be saved, requirements for heavy current starting can be met, high assembling efficiency is achieved, and good modularization effects are fulfilled.

The invention relates to slabs for buildings, and particularly relates to a slab for buildings combined with interlocking blocks as well as a jointly shock-resistant assembly method for the slab and a wall body. The slab is characterized in that the slab body is prefabricated by lightweight aggregate concrete and is respectively consistent with the center line of the bay of a house in size and shape. The method comprises the following steps: placing a pre-weaved double-layered rhombic steel mesh framework on a horizontal vibrating mould table; pouring special quick-setting cement, fireproof lightweight aggregate and river sand packing on the mould table through stirred concrete; stripping the mould through vibration to preserve and mould; and then, conveying the whole slab to the field for pin assembly through hoisting and conveying equipment on interlocking hollow or blind hole bricks or a ring beam brick wall body. According to the slab provided by the invention, the quality of the slab is fully ensured, and the slab is simple and quick to assemble, so that the building speed of houses can be effectively improved. Therefore, the slab provided by the invention is particularly suitable for multilayer houses developed and built by groups in rural towns.