| |||
频率组 | |||
频群 |
frequency group : 34 phrases in 13 subjects |
Air defense | 4 |
Artificial intelligence | 1 |
Biotechnology | 1 |
Communications | 3 |
Electronics | 3 |
Information technology | 3 |
Metallurgy | 2 |
Oil / petroleum | 1 |
Space | 2 |
Sports | 2 |
Technology | 9 |
Telecommunications | 2 |
United States | 1 |