【单选题】【消耗次数：1】
常用的几类静定结构包括（ ）。①梁②桁架 ③三角拱 ④三铰刚架
①
②④
②
①②③④
③
①③④
④
①②③
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在竖向荷载作用下，三铰拱的水平推力与矢高比成反比，且与拱轴线形状有关
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弯矩、轴力均等于零，只有剪力
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