在正弦电路中，电阻元件的功率因数等于0。（   ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69471' and id < 4499959 and id<>'4499959' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69471' and id > 4499959 and id<>'4499959' order by id asc limit 5