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單項(xiàng)選擇題

Excessive lube oil consumption can result from worn or broken（）

A.piston rings
B.valve guides
C.valve seals
D.all of the above

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單項(xiàng)選擇題

In an operating diesel engine, pre-ignition can be caused by （）

A.excessively late fuel injection
B.oil in the air charge
C.water in the fuel
D.injection continuing after the fuel charge is ignited

單項(xiàng)選擇題

One cause of diesel engine surging can be a result of （）

A.injection pump plungers stuck or worn
B.low compression
C.solenoid stuck open
D.fuel tank too full