Crankcase sweating in a refrigeration system is caused by （）.<br>A:a stuck solenoid valve<br>B:a shortage of refrigerant<br>C:too much oil in circulation<br>D:too much superheat

Crankcase sweating in a refrigeration system is caused by （）.
A:a stuck solenoid valve
B:a shortage of refrigerant
C:too much oil in circulation
D:too much superheat

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