单项选择题
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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相关考题
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单项选择题
The evaporating pressure in R22 vapor compression refrigeration plant should be （） atmospheric.
A.below
B.above
C.equal to
D.much larger than -
单项选择题
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 -
单项选择题
The starting air bottle should be pumped up to maximum pressure by the （） before start of the engine.
A.air compressor
B.refrigeration compressor
C.vacuum pump
D.purifier
