下列表格中各项分类都正确的一组是[     ]纯净物混合物电解质非电解质

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='22315' and id < 1957246 and id<>'1957246' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='22315' and id > 1957246 and id<>'1957246' order by id asc limit 5