【单选题】【消耗次数：1】
产后出血的定义正确的是
①
胎儿娩出24h内，阴道分娩者出血量≥400ml
②
胎儿娩出24h内，阴道分娩者出血量≥500ml
③
胎儿娩出12h内，阴道分娩者出血量≥400ml
④
胎儿娩出12h内，阴道分娩者出血量≥500ml
⑤
胎儿娩出12h内，阴道分娩者出血量≥1000ml
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