vitamin D metabolism occurs in the skin when the skin is exposed to
A、
sunlight
B、
keratin
C、
water
D、
sebum
发布时间：2025-08-21 23:26:17
请在 下方输入 要搜索的题目：
B、
C、
D、
推荐参考答案 (
由 快搜搜题库 官方老师解答 )
答案：A
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