某正弦电路中V，A，则该电路功率因数是（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69470' and id < 4499491 and id<>'4499491' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69470' and id > 4499491 and id<>'4499491' order by id asc limit 5