对三虚铰在无穷远处体系为非几何不变的结论提出了另一种论证方法；
Another demonstrating method on the conclusion of the system with three virtual hinges at infinite point being variable in geometry is brought out.
这些问题包括三刚片规则的准确表述、带虚铰的三刚片规则的证明、与对称性有关的命题的证明和删减影响线有关内容的可能性等等。
The problems involve the correct expression of the rule of three rigidity pieces, the proving of the proposition about symmetry and possibility of reducing contents about the influence line etc.
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