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单选题
Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?（）
A
Sludge
B
Gasoline
C
Fuel oil
D
Lube oil
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单选题Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）A
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Vapor pockets formed in the suction flow streamB
Rough easing volute surfacesC
Worn wearing ringsD
Heavy fluid in the flow stream
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