- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
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
你可能感興趣的試題
