.负载上获得最大功率时，电源的利用率最高。（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69473' and id < 4501278 and id<>'4501278' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69473' and id > 4501278 and id<>'4501278' order by id asc limit 5