(多选题)11: 结构力学的任务是（）。
A: 研究结构的组成规律和合理形式
B: 分析结构内力
C: 计算结构变形
D: 研究结构的稳定性
一、选择填空：阅读下面的对话或句子，从A、B、C三个选项中选出一个能填入空白处的最...
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