高二英語telephones-文庫吧資料
2024-11-17 23:05本頁面
【正文】 gnals electrical signals How does a telephone work? Why did people have to wind the handle before making a call? What did the telephone operator do? What are satellites used for? America China electrical signals electrical signals What was the way to send signals in the past? metal wires light signals light signals How to send signals now? thin glass
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