單項選擇題

Black smoke exhausting from an operating diesel engine can be caused by （）

A.fuel dribbling from leaking fuel injectors
B.burning fuel with a high carbon content
C.burning fuel with a high vanadium content
D.burning fuel with a lower sulphur content

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單項選擇題

White smoke exhausting from a diesel engine can be caused by a （）

A.high combustion temperature
B.high compression pressure
C.cracked cylinder liner
D.fuel with a high vanadium content

單項選擇題

White smoke exhausting from a diesel engine can be caused by （）

A.low combustion temperature
B.a leaking fuel nozzle check valve
C.late fuel injection
D.plugged oil-scraper ring hole

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Black smoke exhausting from an operating diesel engine can be caused by （）

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White smoke exhausting from a diesel engine can be caused by a （）

White smoke exhausting from a diesel engine can be caused by （）