A、reduce the wear of bearing surfaces
B、cool the bearing surfaces
C、assist in sealing bearing surfaces
D、all of the above
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A、reduce the wear of bearing surfaces
B、cool the bearing surfaces
C、assist in sealing bearing surfaces
D、all of the above
时间：2022-01-05 10:55 关键词： 船舶电气与船舶安全 水路交通运输技能考试 海船船员考试
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