题目内容

关于轴向拉压杆斜截面上的正应力和切应力，错误的表述有（）

A. 正应力和切应力不可能同时达到最大值；B:正应力达到最大值时切应力为零
B. C．切应力在45º的斜截面上达到最大值，在–45º的斜截面上达到最小值
C. D．正应力和切应力不可能同时为零
D. E．正应力为其最大值的一半的截面上，切应力达到最大值
E. F．正应力为其最大值的一半的截面上，切应力在数值上与正应力相等

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