 |
| |||
| 切换频率; 开关频率 | |||
| switch frequency: 16 phrases in 10 subjects |
| Air defense | 1 |
| Dermatology | 1 |
| Electronics | 3 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Information technology | 2 |
| Project management | 1 |
| Space | 1 |
| Technology | 4 |
| Telecommunications | 1 |
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