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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相关考题
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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 -
单项选择题
During compressors running the accumulated moisture in the separators must be （）.
A.drained off
B.collected
C.sent to the crankcases
D.separated with oil
