| |||
| 调制频率 | |||
|
modulating frequency : 8 phrases in 5 subjects |
| Air defense | 1 |
| Electric machinery | 1 |
| Space | 1 |
| Technology | 2 |
| Telecommunications | 3 |
| |||
| 调制频率 | |||
|
modulating frequency : 8 phrases in 5 subjects |
| Air defense | 1 |
| Electric machinery | 1 |
| Space | 1 |
| Technology | 2 |
| Telecommunications | 3 |