单项选择题

Diesel engine valve springs function to （）

A.hold the valves open
B.keep the valves off their seats until the exhaust stroke is completed
C.close the valves
D.open inlet valves when the air injection cycle begins

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Worn diesel engine intake valve guides can result in （）

A.increased engine breathing efficiency
B.excessive valve lash
C.excessive lube oil consumption
D.lower than normal fuel consumption

单项选择题

If a diesel engine runs roughly, which of the systems listed is most likely to be at fault?（）

A.Fuel
B.Lubricating
C.Cooling
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