 |
| |||
| class 4/5 system; combined exchange; combined local/toll system; combined local/transit exchange; combined system | |||
|
central combinada : 6 фраз в 4 тематиках |
| Материаловедение | 2 |
| Окружающая среда | 1 |
| Связь | 2 |
| Электроника | 1 |
|
| |||
| class 4/5 system; combined exchange; combined local/toll system; combined local/transit exchange; combined system | |||
|
central combinada : 6 фраз в 4 тематиках |
| Материаловедение | 2 |
| Окружающая среда | 1 |
| Связь | 2 |
| Электроника | 1 |