单项选择题
A.the discharge temperature low B.the discharge temperature high C.the discharge pressure rise D.the inter-stage pressure low
By far the greatest item of maintenance of the reciproc...
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
A compressor should never be stopped （）.A.without first...
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
Some （） lying in the starting air lines will give rise ...
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
