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| the determination of rig | |
| 作者姓名： | idity |
| 作者单位： | is pro |
| 摘 要： | per or not. For many years, scientists in the world have done a lot of research work in this field. As opinions vary, no unanimous conclusion can be drawn.In this paper, the physical concept of each items in rigidity is analysed first, an |
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