白喉患者的病原体是白喉棒状杆菌，其症状主要由无毒的白喉棒状杆菌获得了产生白喉毒素的能力所致，其产生白喉毒素的机制是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='24321' and id < 2098968 and id<>'2098968' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24321' and id > 2098968 and id<>'2098968' order by id asc limit 5