一个简单的考生答题系统，用户登录后点击在线答题，系统则从数据库随机抽取20个题目！-Candidates answer a simple system, users log in click online questions, the system database were randomly selected from 20 topics!

在线知识答题系统，可以附加数据库等操作。可以下载题库-Answer online knowledge systems, database operations can be attached. Questions can be downloaded