If a refrigeration compressor is running continuously without lowering the temperature in the refrigerated space, the trouble may be （）.<br>A:a shortage of compressor oil<br>B:warm food in the refrigerator<br>C:excessive condenser cooling water<br>D:a shortage of refrigerant

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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