考试
2020-03-16 11:44:26

8639 To maintain the down stre

题目描述

To maintain the down stream pressure within defined limits over a range of flow and despit



To maintain the down stream pressure within defined limits over a range of flow and despite any changes in supply pressure, _____ is fitted.

A.a check valve

B.a gate valve

C.a pressure reducing valve

D.a quick closing valve

请帮忙给出正确答案和分析,谢谢!

答案解析

C

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