学生在线考试系统，考生考试模块，包括答题主界面，选择试卷，考生答题，考生交卷，管理员试题管理模块，包括增加，删除试卷，增加，删除试题等-Online examination system for students, candidates test module, including the answer of the main interface, select the papers, the candidates answer, candidates carry out an assignme