无功功率可以理解为这部分功率在电路中不起任何作用。(  )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69513' and id < 4503389 and id<>'4503389' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69513' and id > 4503389 and id<>'4503389' order by id asc limit 5