单项选择题

A diesel engine is supercharged in order to（）

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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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

单项选择题

A.greater overall efficiency
B.greater fuel economy
C.lower horsepower
D.lower compression ratio