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单选题
Heavy residual fuel oils are heated prior to centrifuging to （）
A
reduce fuel weight
B
increase specific gravity
C
separate fuel from lube oil
D
reduce fuel viscosity
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igniting
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考题
单选题（） fuel oils （） lubricating oils require treatment before passing to the engine.A
Both；andB
Neither；norC
Either；orD
Both；or
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