 |
| |||
| sistema indirecto | |||
|
sistema independente : 10 phrases in 5 subjects |
| Communications | 2 |
| Electronics | 4 |
| Environment | 1 |
| Natural sciences | 1 |
| Transport | 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