查詢 text:Communication. AND pyr:"1989" AND sb:"Telecommunication systems." ,共 2 筆
出版年 1989
主題 Telecommunication systems.
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Changing the rules :technological change, international competition, and regulation in communications
- 作者: Crandall, Robert W.
- 出版: Washington, D.C. : Brookings Institution ©1989.
- 資料類型: 電子書
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Growing vulnerability of the public switched networks :implications for national security emergency preparedness : a report
- 作者: National Research Council (U.S.).
- 出版: Washington, D.C. : National Academy Press 1989.
- 資料類型: 電子書