平均负荷为某段时间内用电设备所消耗电能与该段时间(    )。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id < 4421596 and id<>'4421596' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id > 4421596 and id<>'4421596' order by id asc limit 5