单项选择题
A.fan B.compressor C.condenser D.evaporator
Hot gas defrosting uses the hot gas from （） to defrost ...
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
The evaporating pressure in R22 vapor compression refri...
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
The primary task of the compressed air system is to del...
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
