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| échelle de Mohs | |||
| degré de dureté; échelle de dureté | |||
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шкала твёрдости : 17 phrases in 5 subjects |
| Chemistry | 6 |
| Geology | 1 |
| Mechanic engineering | 4 |
| Metallurgy | 5 |
| Oil and gas technology | 1 |
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