便血的病机是(  )。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='25921' and id < 2175155 and id<>'2175155' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25921' and id > 2175155 and id<>'2175155' order by id asc limit 5