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| среднее зерно (0,25-0,5 мм) | |||
| grain moyen: 23 phrases in 6 subjects |
| Chemistry | 1 |
| Geology | 16 |
| Mechanic engineering | 2 |
| Metallurgy | 1 |
| Oil and gas technology | 1 |
| Technology | 2 |
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