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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

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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

單項(xiàng)選擇題

The primary task of the compressed air system is to deliver the starting air necessary for （）

A.starting the ME
B.starting the emergency electric alternator
C.driving the main turbine
D.driving the turbocharger

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