（    ）系统适用于单相负荷比较集中的场所。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='55203' and id < 3486409 and id<>'3486409' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='55203' and id > 3486409 and id<>'3486409' order by id asc limit 5