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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69471' and id < 4499882 and id<>'4499882' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69471' and id > 4499882 and id<>'4499882' order by id asc limit 5
,当它通过R=2Ω的电阻时,电阻上消耗的功率( )。
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