单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

A.a cracked liner
B.burning lube oil
C.an overloaded engine
D.insufficient combustion air