单项选择题
A.too great a loading B.fouled turbocharger C.bad combustion D.excessive air
The rim of the piston may contain cut-out portions to a...
单项选择题The rim of the piston may contain cut-out portions to accommodate （） when they open.
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
