Nowadays, the analysis on internal force of structure is based on the hypothesis of plane system, but it can not solve the problem of stereoscopy.
现阶段在工程结构内力分析中，主要是基于平面体系的假设，并不能完全解决结构的空间性问题。
This paper discusses the problem of the reduction of inertial force system of rigid body in plane motion .
讨论了平面运动刚体上惯性力系的简化问题；
This paper discusses the problem of the reduction of inertial force system of rigid body in plane motion .
讨论了平面运动刚体上惯性力系的简化问题；
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