要除去硫酸钠里混有少量的碳酸钠，应加入的物质是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21370' and id < 1853689 and id<>'1853689' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21370' and id > 1853689 and id<>'1853689' order by id asc limit 5