14 下列何種物質是皮膚中合成維生素 D 的原料?
(A)7-hydroxycholesterol
(B)7-dehydrocholesterol
(C)cholesterol
(D)7-hydrocholesterol
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統計: A(181), B(1042), C(35), D(39), E(0) #560996
統計: A(181), B(1042), C(35), D(39), E(0) #560996