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[单选题]

女性，30岁。月经量多已2年，近3个月来感乏力、头晕、心悸，查血红蛋白65g／L，白细胞6.0×109／L，血小板140×109／L，骨髓象：粒比红为1：1，红细胞增生活跃，中晚幼红细胞45％.，体积小，胞浆偏蓝，治疗首选

A.肌注维生素B12

B.口服,铁剂

C.输血

D.脾切除

E.口服.叶酸

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第2题

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第4题

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第5题

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第8题

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