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| оптическая плотность дыма | |||
| густота дыма; плотность задымления | |||
| плотность дыма | |||
| smoke density: 14 phrases in 9 subjects |
| Automated equipment | 2 |
| Chemistry | 1 |
| Ecology | 1 |
| Firefighting and fire-control systems | 3 |
| Military | 3 |
| Natural resourses and wildlife conservation | 1 |
| Nautical | 1 |
| Technology | 1 |
| Telecommunications | 1 |
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