仅能预防支气管哮喘，而对已发作者无效的药物是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30291' and id < 2449260 and id<>'2449260' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30291' and id > 2449260 and id<>'2449260' order by id asc limit 5