單項(xiàng)選擇題

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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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

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