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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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單項選擇題

White smoke issuing from the exhaust of an auxiliary diesel engine valve opening （）

A.the engine is overloaded
B.the engine is cold
C.there is too much lube oil in the cylinders
D.the turbocharger is fouled

單項選擇題

White smoke exhausting from a diesel engine can result from （）

A.high exhaust temperature
B.high lube oil temperature
C.low turbo-charger speed
D.low cooling water temperature