说明：  随机出题系统，可实现从动态题库中随机提取题目显示，并可显示答案的答题系统。系统主要包括菜单界面、题库读入、随机多次出题、答案显示、题库分类、分类随机多次出题、答案显示、题库更新等部分。
(Random questions system, enabling dynamic exam randomly extracted from the subject shows that the system can display the answer answer. The system includes menu interface, exam reads, random times out of question, the answer is displayed, exam classification, classification random times out of question, the answer is displayed, exam updates and other parts.)