| |||
| 多频信号检测 | |||
|
multi-frequency : 58 phrases in 12 subjects |
| Air defense | 4 |
| Aviation | 5 |
| Communications | 1 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Electronics | 10 |
| Fishery fishing industry | 1 |
| Geophysics | 3 |
| Information technology | 3 |
| Metallurgy | 1 |
| Space | 11 |
| Telecommunications | 17 |