问题
单项选择题
（2007）压杆失衡是指压杆在轴向压力的作用下：（）
A.局部横截面的面积迅速变化
B.危险截面发生屈服或断裂
C.不能维持平衡状态而突然发生运动
D.不能维持直线平衡而突然变弯
答案
参考答案：D
解析：根据压杆稳定的概念，压杆稳定是指压杆直线平衡的状态在微小外力干扰去除后自我恢复的能力。因此只有选项D正确。
搜题请搜索小程序“爱下问搜题”
（2007）压杆失衡是指压杆在轴向压力的作用下：（）
A.局部横截面的面积迅速变化
B.危险截面发生屈服或断裂
C.不能维持平衡状态而突然发生运动
D.不能维持直线平衡而突然变弯
参考答案：D
解析：根据压杆稳定的概念，压杆稳定是指压杆直线平衡的状态在微小外力干扰去除后自我恢复的能力。因此只有选项D正确。
Tang Hai is chatting with his e-pal David on QQ (T: Tang Hai D: David) D: Hi. How is it going these days? T: Pretty good! We celebrated our Dragon Boat Festival(端午节) last week. D: Dragon Boat Festival? 小题1: T: To remember an ancient Chinese poet(诗人)。 D: How do you usually celebrate it? T: 小题2: But this year, we did something more interesting. D: What did you do? T: Our school had a Dragon Boat race. D: 小题3: who won the race? T: Our class. D: 小题4: T: Thanks a lot. I hope you can come to China sometime. D: 小题5: I’m interested in Chinese traditions. Tell me more about them next time. T: Ok, I will. See you. D: See you!
|