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niveau stable | |||
niveau constant |
постоянный уровень: 15 phrases in 11 subjects |
Armored vehicles | 1 |
Astronautics | 2 |
Electronics | 1 |
Forestry | 2 |
General | 1 |
Hydraulic engineering | 2 |
Meteorology | 1 |
Natural resourses and wildlife conservation | 1 |
Radio | 1 |
Technology | 2 |
Trucks/Lorries | 1 |