【单选题】【消耗次数：1】
骨髓增生程度正确的是
①
有核细胞：成熟红细胞大约1：1，增生明显活跃
②
增生活跃的骨髓象每高倍视野有核细胞数为50-100个
③
增生减低主要见于继发性贫血患者
④
增生极度减低有可能骨髓稀释
⑤
增生极度活跃见于健康人
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