 |
| |||
| low and medium frequency | |||
| 中低频: 20 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 5 |
| Construction | 1 |
| Electronics | 4 |
| General | 3 |
| Geophysics | 2 |
| Project management | 1 |
| Radio | 1 |
| Space | 1 |
| Technology | 1 |
|
| |||
| low and medium frequency | |||
| 中低频: 20 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 5 |
| Construction | 1 |
| Electronics | 4 |
| General | 3 |
| Geophysics | 2 |
| Project management | 1 |
| Radio | 1 |
| Space | 1 |
| Technology | 1 |