某产妇,宫缩过强,胎儿娩出迅速,新生儿体重4000g,产后阴道流血较多,为持续性,色鲜红,能凝固,出血原因最可能是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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