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單項(xiàng)選擇題

Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）

A.back
B.side
C.gap
D.bottom

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單項(xiàng)選擇題

In a four-cycle diesel engine piston blow-by can result in increased（）

A.crankcase pressure
B.compression pressure
C.scavenge pressure
D.exhaust manifold pressure

單項(xiàng)選擇題

The most effective method in removing water from diesel fuel oil is by（）

A.centrifuging the fuel
B.using it in the engine
C.heating the fuel tanks
D.starting the fuel