预防维生素D缺乏性佝偻病的预防量是A.50IU B.100IU C.200IU D.300IU E.400IU

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问题预防维生素D缺乏性佝偻病的预防量是

选项 A.50IU
B.100IU
C.200IU
D.300IU
E.400IU

答案E

解析

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