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Lube oil pumps taking suction from the sump of mos...

海船船员考试

单选题

Lube oil pumps taking suction from the sump of most small marine engines are usually （）.

发布日期：2021-03-22

A.of the diaphragm type

B.of the centrifugal type

C.of the positive displacement type

D.independently driven by electric motors

标签： lube oil pumps taking suction

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