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 （）.
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 （）.
单项选择题 Compressed air is used on board ship for all the following purposes except （）.
