下图所示正弦电路中，R=XL=Xc=lQa则电路的功率因数；1为（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32632' and id < 2594805 and id<>'2594805' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32632' and id > 2594805 and id<>'2594805' order by id asc limit 5