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In 1906, the "SOS" distress signal was adopted at the International Radio Telegraphic Convention in Berlin.
1906年,在柏林举行的国际无线电通信大会上采用了SOS遇难信号。
youdao
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In 1906, the "SOS" distress signal was adopted at the International Radio Telegraphic Convention in Berlin.
1906年,在柏林举行的国际无线电通信大会上采用了SOS遇难信号。
youdao