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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 （） achieving a gas seal.

A、play a great part on

B、run a role in

C、plays an important part in

D、acts as important part at

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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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 （）.