 |
| |||
| 标准频率信号 | |||
| standard frequency signal: 17 phrases in 7 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Communications | 1 |
| Earth sciences | 2 |
| Space | 2 |
| Technology | 8 |
| Telecommunications | 2 |
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Add | The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Report an error
| Get short URL | Language Selection Tips