A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.<br>A:a shortage of refrigerant in the system<br>B:air in the system<br>C:an accumulation of liquid refrigerant in the crankcase<br>D:a shortage of oil in the crankcase

A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.
A:a shortage of refrigerant in the system
B:air in the system
C:an accumulation of liquid refrigerant in the crankcase
D:a shortage of oil in the crankcase

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