学生成绩统计查询系统，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。很好的实现管理学生成绩问题。-Student performance statistics query system, students, curriculum, statistics, query, the system shows five menu, click a different menu sub-menu will appear. Achieve good management of s