学生成绩管理系统的功能为录入学生、信息查询、学生信息删除、学生信息、修改学生信息、录入学生成绩、查询平均成绩、按成绩对学生进行排序、查看挂科学生。-Students　performance management system function for entry students information query students information delete information modify students information input students student achievement inquires according to the results of the average grade students in order to check hang students