.如图所示，u=-10V，则6V电压源发出的功率为（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69350' and id < 4489467 and id<>'4489467' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69350' and id > 4489467 and id<>'4489467' order by id asc limit 5