发射结正向偏置，集电结反向偏置是晶体管工作在（）区的外部条件。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30217' and id < 2444169 and id<>'2444169' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30217' and id > 2444169 and id<>'2444169' order by id asc limit 5