The system is a library management system, to achieve the book information to add, modify delete functions, and can achieve the function of borrowing and returning books.
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This difference is important when you write functions that are supposed to modify lists. For example, this function does not delete the head of a list.
这以区别相当重要，尤其是当你写一些要修改列表的函数的时候。比如下面这个函数并没有能够删除列表的第一个元素。
This system can achieve sub-quarters health query, input, modify, delete, sorting and other functions.
说明：本系统可以实现宿舍卫生分的查询、录入、修改、删除，排序等功能。
One user login module super administrator can modify the competence of other users, only a higher authority administrator to use the user to delete, add, edit, and other functions.
其中用户登录模块中超级管理员可以修改其他用户的权限，只有权限较高的管理员才能使用用户的删除、添加、修改等功能。
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