单项选择题

By far the greatest item of maintenance of the reciprocating air compressors concerns （）.

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

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单项选择题
A compressor should never be stopped （）.

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
Some （） lying in the starting air lines will give rise to corrosion and can cause water hammer.

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