调相机的作用是向系统(    )，对调整网络电压和提高电能质量有较好的作用。  

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69462' and id < 4498650 and id<>'4498650' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69462' and id > 4498650 and id<>'4498650' order by id asc limit 5