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.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

单项选择题

A.drained off
B.collected
C.sent to the crankcases
D.separated with oil