在刚体上的A点加一力F，如图所示，能否在B点加一个力使得刚体处于平衡状态？能https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/642a54c7254e4d94bd863acc9df21c46.png
举一反三
- 在刚体上的A点加一力F,如图所示,能否在B点加一个力使得刚体处于平衡状态?能
- 刚体的A、B、C三点作用有三个力，恰好构成封闭的三角形，刚体平衡。https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/be9f2fa90d334738b8f8d6ae01203a1b.png
- 设EI为常数，图示刚架支座C点的水平位移为（ ）。<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/2dea6754bc2a40df98d40ddc4d88e4ee.png"/> A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/876c3a939abd447fae12277cbbdf2885.png"/> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/9452dbf33f1b42bab8d279978b5294d8.png"/> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/c86de891367447249efb95cf363ee7cf.png"/> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/ba048b2d5eb149fbbe5a7b419903ef5b.png"/>
- 如图，尺寸正确标注的图形是： A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/d7f5cc79b50247069cd9347901587ce7.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/25e08fdcfa8d42849b8cce450503b0ef.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/0dd480e6dba2481197db009c3b98eac9.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/0f8bb7ecb6c74b1290c04861b5c3f7b8.png">
- 一刚体受到四个力的作用，各力的作用点位于A、B、C、D处，而且四个力形成一自行封闭的力多边形（如图所示），由此刚体处于（）状态。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/17b0bb6b5fb742e49b5509fb59049349.png