单项选择题

A properly honed diesel engine cylinder liner will（）

A.prevent piston ring wear
B.shorten the ring break-in period
C.prevent cylinder liner glazing
D.appear slick and glazed

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单项选择题

A.lower the no-load RPMs
B.provide more air for combine with the fuel
C.increase the no-load RPMs
D.provide more fuel combine with the air

单项选择题

A.high firing pressure
B.overload of that particular cylinder
C.smoky exhaust
D.cooling water temperature rise

单项选择题

A.valve overlap
B.volumetric efficiency
C.turbulence of the air change
D.fuel efficiency