请问摩尔斯电码的由来是什么?它有哪些表达方式?
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![请问摩尔斯电码的由来是什么?它有哪些表达方式?](/uploads/image/z/686936-56-6.jpg?t=%E8%AF%B7%E9%97%AE%E6%91%A9%E5%B0%94%E6%96%AF%E7%94%B5%E7%A0%81%E7%9A%84%E7%94%B1%E6%9D%A5%E6%98%AF%E4%BB%80%E4%B9%88%3F%E5%AE%83%E6%9C%89%E5%93%AA%E4%BA%9B%E8%A1%A8%E8%BE%BE%E6%96%B9%E5%BC%8F%3F)
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