The international morse code distress signal, S.O.S.

国际通用的莫尔斯电码遇险信号SOS。

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Morse Code program information - This program is designed to help the beginner learn to receive and send the International Morse Code.

莫尔斯电码的节目信息-此计划的目的是帮助初学者学习接收和发送的国际摩尔斯电码。

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Morse Code program information - This program is designed to help the beginner learn to receive and send the International Morse Code.

莫尔斯电码的节目信息-此计划的目的是帮助初学者学习接收和发送的国际摩尔斯电码。

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