分娩过程中促使胎头下降的因素有

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30782' and id < 2478831 and id<>'2478831' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30782' and id > 2478831 and id<>'2478831' order by id asc limit 5