下列哪项的紊乱，是月经先后无定期的表现特征

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28893' and id < 2353336 and id<>'2353336' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28893' and id > 2353336 and id<>'2353336' order by id asc limit 5