正常月经周期以28日为例，月经周期第 20〜23日称为（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25966' and id < 2177931 and id<>'2177931' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25966' and id > 2177931 and id<>'2177931' order by id asc limit 5