????(Communication Medium)?????????????,??????????(Telephone Line)?????(Coaxial Cable)???(Microwave)?????(Satellite)???(Fixed Net) ? - PowerPoint PPT Presentation

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????(Communication Medium)?????????????,??????????(Telephone Line)?????(Coaxial Cable)???(Microwave)?????(Satellite)???(Fixed Net) ?

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1.1 1.1.1 ... – PowerPoint PPT presentation

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