学生角色登陆能够在首页查看到自己所有能够选修的课程及对课程进行选修和退选，并对自身的基本信息的查询和更改。
Students landed roles in the home can all be able to see into their elective courses and elective courses and to withdraw from the election, and to query and change their basic information.
系统对学生角色提供个人信息查看、选课管理以及其他功能；
The system provides a function, which is good for students to check their personal information and the management of selecting course, to the characters of the students.
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