莫尔斯电码SOS是国际公认的紧急呼救信号。每当危机出现时,SOS呼救信号就会传向四面八方,无数生命因此得以挽救。7月1日,SOS呼救信号成为国际统一呼救信号整整100年,创造了百年辉煌历史。莫尔斯电码SOS最先被德国政府采用,1905年4月生效的德国国家无线电条约引入这一电码。1906年,第二届国际无线电会议在德国柏林召开,会议签署的条约中,将 Morse code SOS is an internationally recognized emergency call signal. Whenever a crisis occurs, the SOS signal will be sent in all directions and numerous lives will be saved. July 1, SOS distress signal became a unified international call for help a full 100 years, creating a century-old glorious history. Morse code SOS first adopted by the German government, entered into force in April 1905, the German national radio treaty to introduce this code. In 1906, the second International Conference on Radio was held in Berlin, Germany. In the treaty signed by the conference,