下面器件只利用了一种载流子参与导电的是( )。（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69424' and id < 4495347 and id<>'4495347' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69424' and id > 4495347 and id<>'4495347' order by id asc limit 5