负载上获得最大功率的条件是电源内阻等于负载电阻，获得的最大功率（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id < 4500020 and id<>'4500020' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id > 4500020 and id<>'4500020' order by id asc limit 5