作图示静定梁FRB的影响线（5分）   解：作影响线如（    ）示。

<img src、"http://sichuan.ouchn.cn/pluginfile.php/61596/question/answer/244205/25/247878/image075a.png" alt="" width="254" height="66">

<img src、"http://sichuan.ouchn.cn/pluginfile.php/61596/question/answer/244205/25/247879/image075b.png" alt="" width="244" height="61">

<img src、"http://sichuan.ouchn.cn/pluginfile.php/61596/question/answer/244205/25/247880/image075c.png" alt="" width="264" height="92">

<img src、"http://sichuan.ouchn.cn/pluginfile.php/61596/question/answer/244205/25/247881/image075d.png" alt="" width="237" height="61">