 |
| |||
| взвешенная выборка | |||
|
weighted sample : 5 phrases in 3 subjects |
| Ecology | 2 |
| Economy | 1 |
| Mathematics | 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