单项选择题
A.Constant tension mooring winch system
B.Hatch cover system
C.Watertight door system
D.Internal combustion engine hydraulic starter system
单项选择题 Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?（）
单项选择题 If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the （）.
单项选择题 Air blowing from the intake air filter of an operating air compressor indicates （）.