| |||
| absorbant neutre; absorbant non-sélectif; milieu absorbant neutre; milieu absorbant non-sélectif; filtre gris | |||
| filtre neutre | |||
|
neutral filter : 14 phrases in 8 subjects |
| Analytical chemistry | 1 |
| Construction | 2 |
| Hobbies and pastimes | 2 |
| Information technology | 1 |
| Medical appliances | 1 |
| Natural sciences | 2 |
| Remote sensing | 1 |
| Technology | 4 |