单项选择题3. Some competitors may blackmail those employees who have kept company documents secretly, forcing them to reveal them. A、正确 B、错误
单项选择题拉伸试验时,试样拉断前能承受的最大拉应力称为材料的( ) A. 抗拉强度 B. 屈服点 C. 弹性极限 D. 刚度