单项选择题
A.Carbon build up in the piston ring belt
B.Faulty operation of a cylinder un-loader
C.Compressor operation in an area of high relative humidity
D.Lifting of intercooler rebel 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 （）.
单项选择题 The part of the anchor windlass that engages the anchor chain for lifting is called the （）.