單項(xiàng)選擇題

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

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

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