画图示伸臂梁，FRA的影响线（10分） 解：作影响线如{10:SHORTANSWER:~=B}示。

<img src、"http://zhejiang.ouchn.cn/pluginfile.php/61596/question/answer/263831/24/247862/image067a.png" alt="" width="236" height="129">

<img src、"http://zhejiang.ouchn.cn/pluginfile.php/61596/question/answer/263831/24/247863/image067b.png" alt="" width="232" height="128">

<img src、"http://zhejiang.ouchn.cn/pluginfile.php/61596/question/answer/263831/24/247864/image067c.png" alt="" width="236" height="122">

<img src、"http://zhejiang.ouchn.cn/pluginfile.php/61596/question/answer/263831/24/247865/image067d.png" alt="" width="231" height="127">