查詢 text:"Telecommunication United States -- Switching systems." ，共 1 筆
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8 0 0 0 0Growing 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