药物消除半衰期是血浆药物浓度下降（ ）所需要的时间。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30920' and id < 2488334 and id<>'2488334' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30920' and id > 2488334 and id<>'2488334' order by id asc limit 5