单项选择题
A.the gases B.the air C.the valves D.the injectors
The removal of （） from lubricating oil will reduce engi...
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
The remaining oil in the lubricating pipes and ducts sh...
单项选择题The remaining oil in the lubricating pipes and ducts should be blown out with （）.
A.atmosphere B.the fresh water C.compressed air D.chemical compounds
The quantity of oil injected into the cylinder can be r...
单项选择题The quantity of oil injected into the cylinder can be regulated （）.
A.by turning the pump plunger B.by vary the fuel valve spring force C.by no means by controlling the governor D.by enlarging or diminishing the injection hole
