单项选择题
Bad valves operation of the reciprocating air compressors can be detected by observation of （）.
A.the discharge temperature low B.the discharge temperature high C.the discharge pressure rise D.the inter-stage pressure low
单项选择题 By far the greatest item of maintenance of the reciprocating air compressors concerns （）.
单项选择题 A compressor should never be stopped （）.
单项选择题 Some （） lying in the starting air lines will give rise to corrosion and can cause water hammer.
