1. Barter was a system of direct exchange of goods.

2. Fundamentally, counter trade refers to the direct exchange of assorted kinds of goods and services.

3. Direct exchange of postal service is accessible between Guiyang and 145 countries.

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4. But this system of "direct exchange" of useful goods, or ''barter, " has severe limitations which exchangers soon run up against.

5. The direct exchange of goods and services which is completed in a short period of time.

6. The card Western Europe much for direct exchange the information with CPU.

7. In this paper, the direct exchange area equations between any two zones in the cylindrical furnace are given.

8. Such an assay does not preclude the direct exchange of serine and glycerol phosphate.

9. The main task of economics was conceived as the study of direct exchange.

10. This term is synonymous with the term main station or Direct Exchange Line (DEL) which are commonly used in telecommunication documents.