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【简答题】
试求图示结构A、B、C处的约束力，A、B处为固定铰链，C处为中间铰链。 关键提示 ：此结构属刚体系统的静定问题，可取整体平衡，再考虑其中一个构件的平衡，最后再利用另一个构件的平衡方程作校核。
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