汽轮发电机均采用凸极式结构。（    ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69206' and id < 4480937 and id<>'4480937' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69206' and id > 4480937 and id<>'4480937' order by id asc limit 5