【单选题】【消耗次数：1】
下列与弯曲梁截面上正应力大小无关的因素是（ ）。
①
荷载
②
截面形状
③
材料强度
④
截面尺寸
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【单选题】
关于下列结论：?1）同一截面上正应力???与切应力???必相互垂直。?2）同一截面上各点的正应力???必定大小相等，方向相同。?3）同一截面上各点的切应力???必相互平行。现有四种答案，正确答案是（???）
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?1）
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