單項(xiàng)選擇題

What function is provided by the crankcase ventilation system on some diesel engines?（）

A.Increases the sludge forming tendency of lube oil
B.Prevents the accumulation of combustible gases
C.Improves lube oil cooling
D.Improves cold weather starting

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單項(xiàng)選擇題

Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）

A.closing later
B.opening sooner
C.staying open for a shorter period of time
D.staying open for a longer period of time

單項(xiàng)選擇題

A diesel engine crankcase ventilation system （）

A.prevents spark generation
B.removes combustible gases
C.determines the level of combustible gases
D.provides inert gas generation in crankcase