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| optical index of refraction | |||
| оптический показатель преломления: 88 phrases in 10 subjects |
| Cables and cable production | 9 |
| Conventional notation | 1 |
| Electronics | 3 |
| General | 1 |
| Makarov | 2 |
| Mass media | 66 |
| Military | 2 |
| Nanotechnology | 1 |
| Silicate industry | 1 |
| Technology | 2 |
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