.工作在匹配状态下的负载可获得最大功率，这时电路的效率最高。（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69506' and id < 4502741 and id<>'4502741' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69506' and id > 4502741 and id<>'4502741' order by id asc limit 5