下列属于维生素C发挥还原作用机制的是( )。
A.促进抗体形成
B.促进铁的吸收
C.促进四氢叶酸形成
D.维持巯基酶的活性
E.清除自由基
参考答案:A,B,C,D,E
下列属于药品质量特性的是()。
A.专属性
B.两重性
C.重要性
D.均一性
---Could you please tell me ___________? ---Of course. For over ten months.
A.how long has he left school
B.how long he has left school
C.when he left school
D.how long he has been away from school