单选题To maintain the down stream pressure within defined limits over a range of flow and despite any changes in supply pressure, （） is fitted.Aa check valveBa gate valveCa pressure reducing valveDa quick closing valve
单选题
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
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