主要功能： （1）能建立、修改和增删学生通讯录 （2）能够按多种方式进行查询。例如：输入姓名可以查询其本人的电话号码等内容。-Main functions: (1) to establish, modify, and add or delete student contacts (2) to query according to a variety of ways. For example: input name can query their own phone N