这是一个简单的学生查询系统，完成删除、增加、查询等功能、学习时看感觉蛮不错、虽然没有写得很好、但是学习用还是可以的、-This is a simple query system for students to complete the deletion, addition, query and other functions, learning to see feel pretty good, although not very well written, but learning is sti