试卷与题库分类结构：T618n11T618题库题目数据库结构（下面的分类名称以上面的分类名称为例说明）题目库CREATE TABLE IF NOT EXISTS pre_it618_exam_questions('id'int(10)unsigned NOT NULL AUTO_INCREMENT,it618_shopid'int(10)unsigned NOT NULL default '0'idit618_class1_id'int(10)unsigned NOT NULL,id'it618_class2_id'int(10)unsigned NOT NULL,idit618_qclass11id`int(10)unsigned NOT NULL,一级章节idit618_qclass12_id`int(10)unsigned NOT NULL,二级章节idit618_qclass13_id`int(10)unsigned NOT NULL,三级章节idit618_qclass221_id`int(10)unsigned NOT NULL,-级知识点idit618_qclass222_id`int(10)unsigned NOT NULL,二级知识点idit618_qclass23_id`int(10)unsigned NOT NULL,三级知识点idit618_qclass3_id'int(10)unsigned NOT NULL,idit618_qclass4_id'int(10)unsigned NOT NULL,idit618_qtypeid'int(10)unsigned NOT NULL default 0',idit618name`varchar(1000)NOT NULL,题目名称`it618 value`varchar(1000)NOT NULL,简答题时的答案内容it618_isok'int(10)unsigned NOT NULL,判断题时的答案it618_order`int(1o)unsigned NOT NULL,题目排序PRIMARY KEY ('id')ENGINE=MyISAM;题目选项库（单选题、多选题、填空题）CREATE TABLE IF NOT EXISTS pre_it618_exam_questions_option('id'int(10)unsigned NOT NULL AUTO_INCREMENT,it618_qid'int(10)unsigned NOT NULL default '0',idit618_name`varchar(1000)NOT NULL,选项内容`it618_isok`int(10)unsigned NOT NULL,选项是否为答案项`it618_order`int(10)unsigned NOT NULL,选项排序PRIMARY KEY ('id')ENGINE=MyISAM;题型库CREATE TABLE IF NOT EXISTS pre_it618_exam_qtype(id'int(10)unsigned NOT NULL AUTO_INCREMENT,"it618_typename'varchar(255)NOT NULL,'it618_order'int(10)unsigned NOT NULL,PRIMARY KEY ('id')ENGINE=MyISAM;INSERT INTO pre_it618_exam_qtype'('id',it618_typename',it618_order')VALUES(1,单选题'，1)，(2,'多选题，2)，(3,'填空题，3)，