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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单项选择题

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

单项选择题

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

单项选择题

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