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【单选题】
足月新生儿,出生2应添加维生素D预防佝偻病的发生,其每天口服维生素D的正确剂量是A.
200~300IU
B.
300~400IU
C.
400~800IU
D.
10万~30万IU
E.
30万~60万IU
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