电路如下所示，求电流源功率为（   ）。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69455' and id < 4498010 and id<>'4498010' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69455' and id > 4498010 and id<>'4498010' order by id asc limit 5