 |
| |||
| 瞬时频率 | |||
|
instantaneous frequency : 29 phrases in 6 subjects |
| Air defense | 5 |
| Aviation | 5 |
| Electronics | 4 |
| Geophysics | 3 |
| Space | 5 |
| Technology | 7 |
|
| |||
| 瞬时频率 | |||
|
instantaneous frequency : 29 phrases in 6 subjects |
| Air defense | 5 |
| Aviation | 5 |
| Electronics | 4 |
| Geophysics | 3 |
| Space | 5 |
| Technology | 7 |