.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='69454' and id < 4497912 and id<>'4497912' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69454' and id > 4497912 and id<>'4497912' order by id asc limit 5