 |
| |||
| 扫描频率 | |||
|
sweep frequency : 53 phrases in 13 subjects |
| Air defense | 8 |
| Aviation | 1 |
| Cartography | 1 |
| Earth sciences | 2 |
| Electronics | 2 |
| General | 2 |
| Oil / petroleum | 2 |
| Otorhinolaryngology | 4 |
| Rail transport | 1 |
| Space | 7 |
| Technology | 17 |
| Telecommunications | 5 |
| Video recording | 1 |