单项选择题
A.case B.currency C.container D.catalogue
A.Certificate of empty tank; Certificate of fumigation B.Certificate of fumigation; Certificate of cleanliness C.Certificate of empty tank; Certificate of cleanliness D.Certificate of cleanliness; Certificate of empty tank
A.letter of credit; letter of guarantee; license B.letter of guarantee; letter of credit; license C.letter of guarantee; license; letter of credit D.license; letter of credit; letter of guarantee