單項(xiàng)選擇題

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

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

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