The injector pump is operated by a cam which drives the plunger （）.

时间：2019-04-14 13:45:32 关键词：is,operated,pump

The injector pump is operated by a cam which drives the plunger （）.

A.top and bottom

B.to and fro

C.up and down

D.back and forth

答案解析

C

举一反三

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