单项选择题
A.system was overcharged with refrigerant
B.system was low on refrigerant
C.suction valves were leaking slightly
D.relief valve was leaking slightly
单项选择题 Air blowing from the intake air filter of an operating air compressor indicates （）.
单项选择题 The part of the anchor windlass that engages the anchor chain for lifting is called the （）.
单项选择题 If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the （）.