單項(xiàng)選擇題

In a refrigeration plant the （） need defrosting.

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

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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

單項(xiàng)選擇題

The evaporating pressure in R22 vapor compression refrigeration plant should be （） atmospheric.

A.below
B.above
C.equal to
D.much larger than