| |||
| 频率反馈调频 | |||
|
frequency feedback frequency modulation : 8 phrases in 5 subjects |
| Air defense | 2 |
| Electronics | 3 |
| Military | 1 |
| Space | 1 |
| Technology | 1 |
| |||
| 频率反馈调频 | |||
|
frequency feedback frequency modulation : 8 phrases in 5 subjects |
| Air defense | 2 |
| Electronics | 3 |
| Military | 1 |
| Space | 1 |
| Technology | 1 |