单项选择题

A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?（）

A.Gasoline
B.Water
C.Lubricating oil
D.sulphur compounds

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单项选择题

A.back clearance
B.side clearance
C.gap clearance
D.taper clearance

单项选择题

A.reduce fuel weight
B.increase specific gravity
C.separate fuel from lube oil
D.reduce fuel viscosity

单项选择题

A.valve guides
B.oil control rings
C.valve seats
D.compression rings