The film of oil between the rings and the liner is not only essential for the lubrication but also （） achieving a gas seal.

时间：2019-04-14 12:41:16 关键词：rings,the,and

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

答案解析

C

举一反三
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