单项选择题

If a refrigeration compressor is running continuously without lowering the temperature in the refrigerated space, the trouble may be （）.

A.a shortage of compressor oil
B.warm food in the refrigerator
C.excessive condenser cooling water
D.a shortage of refrigerant

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单项选择题

A.molecular fluid vibration
B.energy losses
C.wide pressure variations
D.mechanical damage to control valves

单项选择题

A.Keeps the refrigerated space cooler
B.Reduces the efficiency of the plant
C.Takes the load off the compressor
D.Has no affect on the system

单项选择题

A.proportional band
B.the error signal
C.the reset signal
D.feedback