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| aperture ratio; aperture stop | |||
| relative aperture; f-number; f-stop | |||
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ouverture relative : 13 phrases in 9 subjects |
| Corporate governance | 1 |
| Earth sciences | 3 |
| Economy | 1 |
| General | 1 |
| Hobbies and pastimes | 1 |
| Nuclear physics | 1 |
| Remote sensing | 3 |
| Technology | 1 |
| Радиоактивное излучение | 1 |
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