气管吸痰每次吸痰时间应小于（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30904' and id < 2486504 and id<>'2486504' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30904' and id > 2486504 and id<>'2486504' order by id asc limit 5