简答题Among the negotiation instruments, as the medium of payment, ________ are used more frequently in foreign trade. A、bills of exchange B、promissory notes C、currencies D、cheques简答题Clean collections are collections of ________ documents without attached ________ documents. A、financial; commercial B、commercial; financial C、customs; shipping D、shipping; customs简答题A bill of exchange is an unconditional order in writing, signed by the maker, directing a certain person to pay a certain sum of money only to or to the order of a certain person. A、正确 B、错误简答题________ is often used in barter trade, compensation trade, processing trade, etc. The importer and exporter open letters of credit in favor of each other, and the two L/C are conditioned on each other. A、Revolving L/C B、Reciprocal L/C C、Back-to-Back L/C D、Anticipatory Credit简答题For large international shipments of goods where customs, duties, tariffs, and clearing are required, a ________ is the safest way for buyers and sellers to trade in physical goods, despite having higher fees and being very paperwork intensive. A、remittance B、collection C、letter of credit D、letter of guarantee