单项选择题
A.5%~8% B.10%~15% C.20%~30% D.35%~40% E.45%~50%
A.0.02g/100ml B.0.04g/100ml C.O.08g/100ml D.0.12g/100ml E.0.16g/100ml
A.叶酸 B.核黄素 C.维生素B6 D.硫胺素 E.尼克酸