如图所示电路中u=-10V,  则 6V电压源发出的功率为下列何值?(     )。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id < 4496779 and id<>'4496779' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id > 4496779 and id<>'4496779' order by id asc limit 5