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发送信号 : 68 phrases in 13 subjects |
Air defense | 1 |
Automobiles | 8 |
Aviation | 2 |
Electronics | 15 |
General | 3 |
Information technology | 3 |
Metallurgy | 1 |
Navigation | 1 |
Oil / petroleum | 2 |
Skydiving | 2 |
Space | 3 |
Technology | 26 |
Telecommunications | 1 |