单项选择题
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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A.trick-wheel
B.follow-up control
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An increase in rotor clearances in a rotary pump will （）.
A.increase discharge pressure
B.decrease pump capacity
C.decrease pump cavitation
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