A more sophisticated pressure reducing valve incorporates a pilot valve which controls the fluid above the valve operating piston in response to downstream pressureThe bold and italic word “which” means （）.<br>A:a pressure reducing valve<br>B:a pilot valve<br>C:an operating piston<br>D:downstream pressure

A more sophisticated pressure reducing valve incorporates a pilot valve which controls the fluid above the valve operating piston in response to downstream pressureThe bold and italic word “which” means （）.
A:a pressure reducing valve
B:a pilot valve
C:an operating piston
D:downstream pressure

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