 |
| |||
| открытая система; незамкнутая система | |||
|
system otwarty : 14 phrases in 4 subjects |
| Construction | 5 |
| Economy | 6 |
| Electrical engineering | 2 |
| Mining | 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