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问题详情

The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving （）.

A、an oil seal

B、removing heat

C、a gas seal

D、cooling the pisto

时间：2022-01-03 04:01 关键词：船舶动力装置海船船员考试

答案解析

C

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