初产妇，28岁。足月妊娠，胎儿娩出后4分钟，出现大量阴道流血，最可能的原因是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='32596' and id < 2591878 and id<>'2591878' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32596' and id > 2591878 and id<>'2591878' order by id asc limit 5