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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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maintain efficient coolingD
alter the fuel density
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centrifugingB
pressurizingC
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excessive purifier operating pressuresD
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volumeD
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increase the fuel injection pressureD
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单选题When the heavy fuel oil is heated to achieve the viscosity of 10-15 cst, may occur.To avoid this, a system is used in most occasions（）A
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boiling and cavitations; pressurizedC
leaking and boiling; low temperatureD
leaking and boiling; pressurized
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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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