下列物质中氧原子数目与15.6 g Na 2O 2中氧原子数一定相等的是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='20453' and id < 1789845 and id<>'1789845' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='20453' and id > 1789845 and id<>'1789845' order by id asc limit 5