开发一个单科课程成绩管理系统，能够实现创建、添加、修改、删除记录以及计算，排序，统计等基本功能，另外还可添加一些拓展功能。-Billing Division of the curriculum development of a performance management system, can achieve to create, add, modify, delete records, as well as calculation, sorting, statistics and other