单项选择题
A.drained off
B.collected
C.sent to the crankcases
D.separated with oil
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 （）.
单项选择题 Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.