单项选择题

A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of（）.

A.water
B.babbitt
C.iron or steel
D.acids

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单项选择题
Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）

A.Impurities
B.Lube oil
C.Gasoline
D.Diesel fuel
单项选择题
The most common contaminate of governor hydraulic fluid is （）.

A.moisture
B.dirt
C.acid
D.air
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