单项选择题
A.10%~14% B.20%~25% C.40%~60% D.60%~70% E.70%~80%
A.维生素A B.维生素B2 C.维生素C D.维生素E E.维生素K
A.2g/d B.4g/d C.6g/d D.8g/d E.10g/d