足月分确后hCG降至正常的时间平均为（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25972' and id < 2179074 and id<>'2179074' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25972' and id > 2179074 and id<>'2179074' order by id asc limit 5