在线考试系统，包含普通用户和管理员用户，包括在线考试成绩的计算、考试用户的添加、删除及用户成绩的查询等功能，可能有不足之处，望大家可以指教！-Online examination system, including the general user and administrator user, including on-line calculation of test scores, test users to add, delete