单选题In a vapor compression refrigeration the evaporating pressure is maintained constant by the action of the （）, which removes vapor from the evaporator at the same rate at which it is formed.AevaporatorBcompressorCcondenserDnone of the above
单选题
In a vapor compression refrigeration the evaporating pressure is maintained constant by the action of the （）, which removes vapor from the evaporator at the same rate at which it is formed.
A
evaporator
B
compressor
C
condenser
D
none of the above
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