单项选择题
A.broken inlet valves
B.broken discharge valves
C.pulsations in the air distribution system
D.overloading of the air distribution system
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 （）.
单项选择题 If the pump for a hydraulic anchor windlass is over heating, the cause may be （）.