有学生、课程、统计、查询、系统说明五个菜单，单击不同的菜单会有子菜单出现，可以管理好学生的成绩，并方便学生成绩的查询。-A student, curriculum, statistics, query, the system shows five menu, click a different menu sub-menu will appear, you can manage student achievement, and to facilitate student achievement o