单项选择题
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
By far the greatest use is for diesel engine starting u...
单项选择题By far the greatest use is for diesel engine starting using air pressure of 25 bar or more provided by （）.
A.rotary compressors B.reciprocating compressors C.centrifugal compressors D.screw compressors
Compressed air is used on board ship for all the follow...
单项选择题Compressed air is used on board ship for all the following purposes except （）.
A.starting diesel engines B.pneumatic control systems C.pneumatic tools D.supercharging air
