图示电路中，5A电流源提供的功率为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id < 4500021 and id<>'4500021' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id > 4500021 and id<>'4500021' order by id asc limit 5