单项选择题

Distortion of the spray pattern of a nozzle or injector may be indicated by a/an（）

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

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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

单项选择题

A.blows out the exhaust gases
B.supplies oxygen for combustion
C.cools the valves and cylinder walls
D.all of the above