（） at the end of the distribution pipe ensures that adequate pressure is maintained by the pump.

时间：2019-04-14 13:13:24 关键词：distribution,pipe,ensures

（） at the end of the distribution pipe ensures that adequate pressure is maintained by the pump.

A.A relief valve

B.An alarm

C.A pressure gauge

D.A non-maim valve

答案解析

B

举一反三

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（） at the end of the distribution pipe ensures that adequate pressure is maintained by the pump.

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