| |||
| 低中频 | |||
| |||
| 低频/中频 | |||
| 低频一中频 | |||
|
low/ medium frequency : 13 phrases in 6 subjects |
| Air defense | 1 |
| Aviation | 3 |
| Electronics | 3 |
| General | 3 |
| Geophysics | 2 |
| Radio | 1 |
| |||
| 低中频 | |||
| |||
| 低频/中频 | |||
| 低频一中频 | |||
|
low/ medium frequency : 13 phrases in 6 subjects |
| Air defense | 1 |
| Aviation | 3 |
| Electronics | 3 |
| General | 3 |
| Geophysics | 2 |
| Radio | 1 |