A. 胎儿娩出后24h内阴道流血量大于500ml B. 胎盘娩出后2~4h内阴道流血量大于500ml C. 胎盘娩出后24h内阴道流血量大于500ml D. 胎儿娩出后2~4h内阴道流血量大于500ml E. 胎儿娩出后1周内阴道流血量大于500ml