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【单选题】
关于产后出血的定义下述哪正确的A.
分娩过程中出现血量 >500ml
B.
胎盘娩出后 24 小时内阴道流血量超过 500ml
C.
胎儿娩出后 24 小时内阴道流血量超过 500ml
D.
产后 24 小时到产后 10 天阴道出血 >500ml
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A.
firstly
B.
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C.
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D.
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