观看免费视频 Morse Code Flashing Light

(33.3 MB) 添加日期21 Feb 2017 播放146次 教育 灯光 安全 科学 Tutorial
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Morse Code Flashing Light

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Video introduces the Morse characters L Q R Z F X Y as sent by flashing light by ships at sea, providing a number of drills to practice basic recognition.