|
indicateur de direction : 55 phrases in 12 subjects |
| Armored vehicles | 5 |
| Astronautics | 1 |
| Automated equipment | 1 |
| Aviation | 6 |
| Hydraulic engineering | 1 |
| Meteorology | 1 |
| Military | 2 |
| Natural resourses and wildlife conservation | 3 |
| Nuclear physics | 1 |
| Radio | 2 |
| Technology | 5 |
| Trucks/Lorries | 27 |