【判断题】【消耗次数：1】
当杆的应力不超过某一限度时，杆的伸长（缩短）量与杆所受的外力和杆长成正比，而与杆横截面面积成反比。
①
正确
②
错误
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横截面面积相等、材料不同的两等截面直杆，承受相同的轴向拉力，则两杆的( )。
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②
横截面上的正应力也相同
③
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横截面上的正应力也不同
⑤
线应变相同
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