局部用氟预防龋齿研讨会上，专业人员就各种措施和方法进行探讨，第四项讨论的是局部涂氟。涂氟操作前必须

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29867' and id < 2422859 and id<>'2422859' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29867' and id > 2422859 and id<>'2422859' order by id asc limit 5