单项选择题
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
During compressors running the accumulated moisture in ...
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
