<p>简支梁受载荷情况如图所示，欲使A截面的弯矩等于零，<img src="https://learnfile.20230611.cn/learnAppQuestion/3a/e5/3ae5061d89d20a1fd4edb2bd86c4ab1b.jpg" style="width: 100%;height: auto;"><img src="https://learnfile.20230611.cn/learnAppQuestion/ca/3f/ca3f6b5f4b803c822e0709d2