《数字交换技术》是2005年中国林业出版社，北京希望电子出版社出版的图书，作者是王罡，穆道生。
采用数字化技术还有其他的好处，交换信息的人可以接收以前名片所无法容纳的更多信息，例如一个文件夹甚至一份简历。
Going digital has other advantages, too. Traders can include information that might be hard to fit on to a traditional business card, such as a portfolio or even a CV.
正如我在之前的专栏中所写，这种技术还可以实现其他类型数字合约的交换。
As I wrote in a previous column, the technology could also permit the exchange of other types of digital contracts.
所以这个数字包括已连接的主线和用于将来连接的可用主线数，包括交换技术操作主线(测试号码)。
This number includes, therefore, main lines already connected and main lines available for future connection, including those used for the technical operation of the exchange (test Numbers).
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