 |
| |||
| maintenance and operations | |||
| maintenance and operation | |||
| 维护与操作: 27 phrases in 7 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Business | 1 |
| Communications | 1 |
| Electronics | 19 |
| Space | 1 |
| 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