二端网络的（   ）等于功率因数角。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69035' and id < 4471170 and id<>'4471170' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69035' and id > 4471170 and id<>'4471170' order by id asc limit 5