下列过程中，最终的白色沉淀不一定是BaSO 4的是 （   ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19786' and id < 1716674 and id<>'1716674' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19786' and id > 1716674 and id<>'1716674' order by id asc limit 5