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單項(xiàng)選擇題

For optimum results, centrifugal purification of heavy fuel oil should be accomplished with the fuel at the lowest practicable（）

A.throughput
B.additive percent
C.cetane number
D.TBN number

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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

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