单项选择题
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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相关考题
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单项选择题
Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）
A.back
B.side
C.gap
D.bottom -
单项选择题
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 -
单项选择题
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
