theoretical draft
... tensor fluid mechanics 张量流体力学 theoretical draft 理论抽力 theoretical fluid dynamics 理论流体动力学 ...
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应用第四强度理论，求解杆柱在扭矩和轴向力条件下的复合应力，设计抽油杆柱。
Rod strings are designed by computing compound stress with the fourth strength energy on the condition of torque and axial force.
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