单项选择题
The removal of （） from lubricating oil will reduce engine wear and possible breakdowns.
A.contaminating water B.contaminated additives C.contaminated fuel D.contaminating impurities
单项选择题 The remaining oil in the lubricating pipes and ducts should be blown out with （）.
单项选择题 The quantity of oil injected into the cylinder can be regulated （）.
单项选择题 The purpose of the flywheel of a diesel engine is to （）.
