进出口（中译英)

Put the following transaction behaviors in the right order in the exact form of A-B-C-D-E-F. A. The exporter presents the documents a sight draft (drawn on thr letter of credit) and bill of lading and commercial invoice to the Negotiating Bank for payment. B. The importer applies for a letter of credit to his Bank. C. Preparation. D. The Importer takes delivery of the goods. E. Reach an agreement. F. The exporter ships the goods to the importer on a common carrier, and get the document of bill of lading.

R(D)是保真度准则（）下熵压缩编码器输出可能达到的最高熵率。

设离散无记忆平稳信源的信息率失真函数为R(D)，若 ，则一定存在编码方法，其译码失真小于非负的.