分析题如图几何组成题28图
扩大基础刚片至ABCD组成钢片Ⅰ,杆看做刚片Ⅱ,刚片Ⅰ、Ⅱ由三根不相交于一点也不平行的链杆相联,符合几何不变的组成规则。所以,可以判别本题体系为:体系几何不变,并且无多余约束。
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