严重贫血时出现晕厥、意识模糊的原因为（）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28309' and id < 2316786 and id<>'2316786' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28309' and id > 2316786 and id<>'2316786' order by id asc limit 5