downhole back flow valve
opening of charge flow valve
Selective Testing Valve
valve resistance coefficient
V6small size flow valve
characteristics of flow resistance
flow resistance
流程阻力
流体阻力
流阻特性
水流阻力
气流阻力
阻力特性
流动阻力
摩擦阻力
河流阻力
流动阻尼
流动阻碍
阻力
风阻
流阻
串流
阻抗
结构形状
flow resistance characteristics
flow resistance coefficient
flow resistance in movable bed
flow resistance in porous media