根据下列材料回答问题 材料一幼儿常晒太阳可以使皮肤表皮细胞的胆固醇转为维生素d预防佝偻病 材料二人在患急性肠炎时往往采取静脉输液 Template




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tomski根据下列材料回答问题 材料一幼儿常晒太阳可以使皮肤表皮细胞的胆固醇转为维生素d预防佝偻病 材料二人在患急性肠炎时往往采取静脉输液 coloring