—定程度的电场、磁场和电磁场都可能对人体有损害。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30397' and id < 2457233 and id<>'2457233' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30397' and id > 2457233 and id<>'2457233' order by id asc limit 5