午日选课系统实现学生多门选课，退选，管理员课程添加，学生、老师数据导入，选课数据导出等选课常用的功能。投入实际使用，反响不错的哦。-Afternoon, elective system to achieve multi course students, to withdraw the election, add course administrator, teachers and students, data import, course data derived classes common