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單項(xiàng)選擇題

If you notice smoke coming fro the crankcase exhaust fan outlet of an operating diesel engine, you would suspect（）

A.a cracked cylinder liner
B.clogged intake ports
C.broken piston rings
D.a faulty head gasket

單項(xiàng)選擇題

When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should（）

A.increase the starting air pressure
B.use a higher than normal cranking speed
C.increase the fuel injection pressure
D.use a fuel having a lower ignition temperature