图1-19所示电路中4V电压源发出的功率为（ ）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30079' and id < 2435293 and id<>'2435293' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30079' and id > 2435293 and id<>'2435293' order by id asc limit 5