单项选择题
A.铁强化婴幼儿食品 B.牛乳喂养应加热 C.提倡母乳喂养 D.早产儿早期补铁 E.早产儿补足维生素B12
A.卵黄囊 B.中胚叶 C.肝脏 D.骨髓 E.脾脏
A.90g/L B.100g/L C.110g/L D.120g/L E.130g/L