The documents you should provide are contract, IdC, invoice and B/L, L/C is the abbreviation for （）B/L is the abbreviation for （）

A．Letter Of Credit, Pacling List

B．Leaking of Containers, Bill Of Laing

C．Letter of Credit, Bill of Lading

D．Leaking of Contaihers, Pacling List

治疗丛集性头痛的常用药物不包括下列哪项

A．麦角胺

B．氯胺酮

C．氧气

D．舒马普坦

E．二氢麦角胺