氙不稳定性 xenon instability
动态不稳定性(dynamic instability)
The material and cross-section of the four columns shown in the figure are all the same. What is the order of instability?http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/0e41844625fd4a3ebdb6901c268ada2f.png
The problem of housing____________ lead to the problem of social instability.