【单选题】【消耗次数：1】
静定梁任一截面剪力影响线在该截面两侧的影响线必然是（）。
①
斜交该点
②
相互平行
③
相互垂直
④
相交于一点
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相关题目
【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（???）
①
?1）
②
?1）、?3）
③
?2）、?3）
④
?1）、?2）
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