图10所示正弦交流电路中，负载获得最大功率时，应为（   ）。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id < 4500009 and id<>'4500009' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id > 4500009 and id<>'4500009' order by id asc limit 5