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What is communications?
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Delivery of messages from sender to receiver
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Communication Media
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| 聲音 | 人聲，鼓聲，鑼聲，軍號
| 光
| 軍旗，旗語， 燈號， 烽火
| 電
| 電流， 無線電波
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Examples of Communication Networks
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烽火臺
| 驛站系統
| Mechanical Telegraph
| Electrical Telegraph
| Telephone Network
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