单项选择题
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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相关考题
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单项选择题
In a refrigeration plant the （） need defrosting.
A.fan
B.compressor
C.condenser
D.evaporator -
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 -
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
