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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