图示体系虽有3个多余约束，但为保证其几何不变，哪两根链杆是不能同时去掉的。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/07fcf7d09de84fc6b5a469e1e861c209.png
举一反三
- 图示体系虽有 3 个多余约束，但为保证其几何不变，哪两根链杆是不能同时去掉的。h...b5a469e1e861c209.png
- 图示体系的几何组成为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/7de2d2a15ec1451d8770881cabe07403.png" /> A: 几何不变，无多余约束； B: 几何不变，有多余约束； C: 常变体系。 D: 瞬变体系；
- 图示结构C截面弯矩为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/4f75b4fba9ff4be1b04a5e100c86c65e.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/145877d7a442497f9fe1266fa394ba2e.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/1b6f8295e7bc44b0b8a2bee20e062fc4.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/18776e34a7504dfcbe40fbdf73958b14.png" /> D: 0
- 图示体系的几何组成为：( )<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/896a80a0354240f5866df1b6476175eb.jpg"/> A: 有多余约束几何不变体系 B: 无多余约束几何不变体系 C: 瞬变体系 D: 常变体系
- 图示桁架1杆的轴力为零。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/163a758d5d0c46e78393266a6a4dafc9.png