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单选题
If a refrigeration compressor is running continuously without lowering temperature as normal in the refrigerator, the trouble may be （）.
A
excessive condenser cooling water
B
warm food in the refrigerator
C
a shortage of refrigerant
D
s shortage of compressor oil
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单选题If a refrigeration compressor is running continuously without lowering the temperature in the refrigerated space, the trouble may be （）.A
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单选题（）are supplied by main switchboard directly.A
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考题
单选题Under normal conditions, the refrigerant enters the compressor in an operating refrigeration system as a （）.A
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has continuously for a long periodB
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oil level is below normalD
starts after a long idle period
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