关于正常主动脉瓣口血流频谱的形态的叙 述，正确的是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31768' and id < 2539845 and id<>'2539845' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31768' and id > 2539845 and id<>'2539845' order by id asc limit 5