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| hardness of material | |||
| твёрдость материала: 14 phrases in 10 subjects |
| Cement | 1 |
| Construction | 1 |
| Makarov | 1 |
| Mechanic engineering | 1 |
| Metallurgy | 2 |
| Nanotechnology | 3 |
| Occupational health & safety | 1 |
| Oil / petroleum | 2 |
| Oil and gas | 1 |
| Oilfields | 1 |
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