單項(xiàng)選擇題

A leaking diesel engine fuel injector will cause（）

A.prolonged maintenance intervals
B.improved atomization
C.greater fuel economy
D.incomplete combustion

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The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually（）

A.greater than the average exhaust manifold pressure
B.less than the average exhaust manifold pressure
C.greater at the turbine wheel than at the impeller
D.greater at reduced engine speed

單項(xiàng)選擇題

A sudden decrease in the diesel engine lube oil viscosity could be an indication of（）

A.loss of additives from the lube oil
B.carbon deposits in the lube oil
C.excessive centrifuging
D.excessive fuel dilution