.下列器件中，(  )的出现是电力电子技术诞生的标志。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id < 4496767 and id<>'4496767' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id > 4496767 and id<>'4496767' order by id asc limit 5