Let this be the angle d theta so it moves in a short amount of time over an angle d theta dS and the arc here is dS, R and the radius is R.
这是角度dθ,它运动了一会儿,运动过角度dθ,弧度是，半径是。
A sand retention screen with large radius and high permeability near the wellbore can be formed by high liquid production and the large amount of sand.
管外高压充填防砂增液技术通过高液量和大砂量在近井地带形成大半径、高渗透的挡砂屏障；
The chloride amount adsorbed is related to cation valence and radius.
氯化物的吸附量与阳离子的价数，离子半径等因素有关。
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