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【多选题】
平面体系几何组成分析的目的包括( )。
A.
判别某一体系是否几何不变
B.
确定某一体系能否作为结构
C.
研究几何不变体系的组成规律,从而设计出各种合理结构。
D.
判断结构是静定的还是定的,以便选择合适的计算方法。
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