 |
| |||
| recurrence rate | |||
|
скорость повторения : 4 phrases in 4 subjects |
| Air defense | 1 |
| Computer networks | 1 |
| Mass media | 1 |
| Quantum electronics | 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