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hardness | |||
hardness degree | |||
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hardness class |
硬度级 : 24 phrases in 11 subjects |
Architecture | 1 |
Automobiles | 2 |
Business | 1 |
Earth sciences | 2 |
Engineering geology | 1 |
Metallurgy | 1 |
Oil / petroleum | 2 |
Oil processing plants | 1 |
Rail transport | 1 |
Technology | 11 |
Wind Energy | 1 |