【单选题】【消耗次数：1】
圆轴扭转时，轴表面各点处于？
①
平面应力状态
②
空间应力状态
③
单向应力状态
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相关题目
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研究一点应力状态的任务是（）。
①
了解不同横截面上的应力变化情况
②
了解横截面上的应力随外力的变化情况
③
找出同一截面上应力变化的规律
④
找出一点在不同方向截面上的应力变化规律
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