师生交流系统的设计与开发
师生交流系统是一个教学系统，主要是帮助学生和教师更好进行交流，更好地将若干课程更加紧密地结合起来，更好地达到学以致用；达到教、学结合的目的；让学生能够更加完整而系统地掌握相关知识和技能。
根据师生交流系统的基本需求，本系统需要完成以下任务：
1、学生用户功能：学生登录之后可以对教学资料查询（可分页），教学视频播放和下载、试题下载。
2、教师用户功能：教师登录本系统可以上传教学资料、视频以及试题，另外可以对这些资料进行增删改查。
3、师生交流功能：学生可以向教师提问，教师可以对学生的提问进行答复。
4、管理用户功能：管理员登录系统之后可以分配学生和教师，对学生和教师进行管理。
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