sql="select t1.question_id,t1.type_id,t1.content,t1.A,t1.B,t1.C,t1.D,t1.E,t1.F,t1.G,t1.score,t2.type_name from t_exam_question as t1 inner join t_exam_question_type as t2 on t1.type_id=t2.type_id where t1.question_id=?";
sql="select t1.question_id,t1.type_id,t1.content,t1.A,t1.B,t1.C,t1.D,t1.E,t1.F,t1.G,t1.score,t2.type_name from t_exam_question as t1 inner join t_exam_question_type as t2 on t1.type_id=t2.type_id where t1.question_id=?";