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單項(xiàng)選擇題

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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單項(xiàng)選擇題

The rate of pressure rise during the period following fuel ignition in a diesel will result in （）

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

單項(xiàng)選擇題

Higher than normal temperature air passing through the intake of a diesel engine will result in（）

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

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