SOS is a Morse Code distress signal. Morse Code is a system that uses dots, dashes and spaces to communicate letters and numbers. It was first created during the 1830s by Samuel F.B. Morse but was ...
Tech Xplore on MSN9 个月
Ukraine war: Why the Russian army is still using morse code more than a century after its ...Even today, many people would be able to identify the characteristic sound of Morse code ... forming the emergency signal SOS ...
当前正在显示可能无法访问的结果。
隐藏无法访问的结果
反馈