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

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单项选择题

A.the lubrication
B.the cooling
C.the moisture separation
D.the valves

单项选择题

A.without first cooling it
B.without first heating it
C.without first unloading it
D.without first loading it

单项选择题

A.air
B.moisture
C.cooling water
D.lubricant