选择题:两跨对称结构在对称荷载作用下,中柱不存在什么内力中柱()为零、剪力为零,只有轴力 。

题目内容:
两跨对称结构在对称荷载作用下,中柱不存在什么内力中柱()为零、剪力为零,只有轴力 。
参考答案:

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