本文在刚性转动与量子系统集体转动特征基础之上，提出了一个计算偶偶变形核基态转动惯量的有效方法。
A effective method of calculating moment of inertia at ground state of even-even deformations nuclei is derived based on rigid rotation and collective rotation nature of quantum systems.
但是链锯在工作状态下如果遇到刚性物体，链锯转动部分会反冲。
However, the rotation part of chain-saw will be kickback, when it is impacted by rigid object.
本文讨论了质量离散分布和连续分布的刚性细杆在转动中切向内力的分布规律。
The tangential internal forces in a rotating rigid thin rod with mass distributed discretely and continuously are discussed.
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