对称三相电路的功率因数角可以是(     )。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68473' and id < 4421024 and id<>'4421024' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68473' and id > 4421024 and id<>'4421024' order by id asc limit 5