 |
| |||
| Filtersystem n | |||
| filter system: 12 phrases in 7 subjects |
| Chemistry | 2 |
| Communications | 1 |
| General | 1 |
| Mechanic engineering | 2 |
| Medical appliances | 2 |
| Natural resourses and wildlife conservation | 2 |
| Technology | 2 |
|
| |||
| Filtersystem n | |||
| filter system: 12 phrases in 7 subjects |
| Chemistry | 2 |
| Communications | 1 |
| General | 1 |
| Mechanic engineering | 2 |
| Medical appliances | 2 |
| Natural resourses and wildlife conservation | 2 |
| Technology | 2 |