要除去烧水壶中的水垢，可选用的试剂是（ )0

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29895' and id < 2424922 and id<>'2424922' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29895' and id > 2424922 and id<>'2424922' order by id asc limit 5