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單項(xiàng)選擇題

What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?（）

A.Refrigerator
B.Refrigerant
C.Cooling medium
D.Brine

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單項(xiàng)選擇題

In a refrigeration plant the （） need defrosting.

A.fan
B.compressor
C.condenser
D.evaporator

單項(xiàng)選擇題

Hot gas defrosting uses the hot gas from （） to defrost the evaporator.

A.starting air bottles
B.diesel engines
C.boilers
D.refrigeration compressors

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