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см. Mohs Scale of Hardness |
hardness: 100 phrase in 13 subjects |
Agriculture | 3 |
Chemistry | 1 |
Coal | 2 |
Earth sciences | 3 |
Environment | 4 |
General | 2 |
Industry | 3 |
Information technology | 3 |
Life sciences | 1 |
Materials science | 9 |
Metallurgy | 45 |
Natural sciences | 2 |
Technology | 22 |