【判断题】【消耗次数：1】
欧拉公式是在假定材料处于弹性范围内并服从胡克定律的前提下推导出来的。
①
正确
②
错误
参考答案：
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对于在弹性范围内受力的拉（压）杆，以下说法中，（ ）是正确的。
①
长度相同、受力相同的杆件，抗拉（压）刚度越大，轴向变形越小
②
材料相同的杆件，正应力越大，轴向正应变也越大
③
杆件受力相同，横截面面积相同但形状不同，其横截面上轴力相等
④
正应力是由于杆件所受外力引起的，故只要所受外力相同，正应力也相同
⑤
E质地相同的杆件，应力越大，应变也越大
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拉压胡克定律的另一表达式为（）。
①
未经检验的，不得用于工程上
②
检验不合格的，应当重新检验，直至合格
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检验要按规定的格式形成书面记录
④
检验要有相关的专业人员签字
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