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Rickets are mainly caused by （） deficiency.

Rickets are mainly caused by （） deficiency.
A、vitamin E
B、Se
C、vitamin A
D、Ca
正确答案：Ca

标签：食品营养学

上一条：（）needs to be given at birth to prevent hemorrhagic disease（出血性疾病）of some newborns.

下一条：（）is slightly higher than UL， to ensure most people intake adequate nutrients.