In motor-ships _____ after passing through main and motion bearings and oil cooled pisto

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In motor-ships, _____, after passing through main and motion bearings and oil cooled pistons, etcis either retained in the bedplate.

A.the fuel oil

B.the lubricating oil

C.the refrigerating oil

D.the hydraulic oil

请帮忙给出正确答案和分析,谢谢!

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