Lube oil pumps taking suction from the sump of most small marine engines are usually （）.<br>A:of the diaphragm type<br>B:of the centrifugal type<br>C:of the positive displacement type<br>D:independently driven by electric motors

Lube oil pumps taking suction from the sump of most small marine engines are usually （）.
A:of the diaphragm type
B:of the centrifugal type
C:of the positive displacement type
D:independently driven by electric motors

出自：海船船员证

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