out of round
径向畸变差 Radial Distortion
结果表明，变径轮式抽油机支架应力最大，前、后肢应力差较大；
The result showed that the stress of framework of variable-diameter wheel pumping unit was largest, stress difference between front leg and back leg of framework was also largest;
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模块上移
模块下移
不移动