关于负离子形成以下说法正确的是（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68449' and id < 4418972 and id<>'4418972' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68449' and id > 4418972 and id<>'4418972' order by id asc limit 5