串联电路中, R1 : R2 :R3=1: 3:2,求功率的比值为( )。（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69414' and id < 4494292 and id<>'4494292' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69414' and id > 4494292 and id<>'4494292' order by id asc limit 5