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【单选题】
图示三铰结构中,若将作用于构件 AC 上的力偶 m 搬移到构件 BC 上去,则 A 、 B 、 C 三铰处的约束反力 。A.
都不变
B.
都改变
C.
只有C铰反力不变
D.
只有C铰反力改变
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