A lubricant often has to perform many duties in any situation in addition to its fundamental job of （）.

时间：2020-05-11 05:55:48 关键词：perform,many,duties

A lubricant often has to perform many duties in any situation, in addition to its fundamental job of （）.

A.resisting oxidization

B.reducing friction

C.promoting moving speed

D.developing inertia

答案解析

B

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