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單項(xiàng)選擇題

Black smoke exhausting from a diesel engine indicates（）

A.proper fuel injection
B.water in the fuel
C.incomplete combustion
D.burning of lube oil

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單項(xiàng)選擇題

Engine operating conditions may be indicated by the color of the exhaust smoke.Black smoke could indicate（）

A.an insufficient speed droop setting
B.an overloaded engine
C.clogged drain holes in the oil control rings
D.complete combustion

單項(xiàng)選擇題

A dark exhaust from a running diesel engine can be caused by （）

A.late ignition
B.water in the fuel
C.high compression temperature
D.starting valve stuck open

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