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当前学科：结构力学
题目：
求图示体系的自振频率和主振型，并验算主振型的正交性。
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解 体系的自振频率和主振型，验算主振型.....
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使用框架图标和导航图标可解决什么问题？
使用验证控件可以大大简化验证过程。
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