When the dispute over duty payment arises between the duty payer and the Customs, the duty payer should first pay the duty and then, within （） of the issuance of the duty memo, apply to the Customs in writing for a reconsideration of the case.

A. 10 days

B. 20 days

C. 30 days

D. one year

在MRSA应用抗生素治疗时，从下列药物中首选哪一种。（）

A.万古霉素

B.头孢他啶

C.氧哌嗪青霉素

D.美洛培南

E.丁胺卡那