关于流产的定义，下列哪项是正确的

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【单选题】【消耗次数：1】

关于流产的定义，下列哪项是正确的

① 妊娠<28周，胎儿体重<1000g

② 妊娠<20周，胎儿体重<500g

③ 妊娠20-27周，胎儿体重<500g

④ 妊娠20-27周，胎儿体重<1000g

⑤ 妊娠12-20周，胎儿体重<500g

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