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單項選擇題

The device used for low-pressure control and high-pressure cutout on a compressor is called （）.

A.cutout
B.controller switch
C.pressure controller
D.cutout switch

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單項選擇題

In a vapor compression refrigeration the evaporating pressure is maintained constant by the action of the （）, which removes vapor from the evaporator at the same rate at which it is formed.

A.evaporator
B.compressor
C.condenser
D.none of the above

單項選擇題

What is the function of thermostatic expansion valve in a compression refrigeration system?（）

A.nonexistent
B.for controlling pressure
C.for controlling superheat
D.for controlling the solenoid valve

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