Mohs' hardness: 28 phrases in 14 subjects |
Chemistry | 1 |
Construction | 2 |
Drilling | 1 |
Electronics | 1 |
Energy industry | 1 |
Makarov | 2 |
Mathematics | 1 |
Oil and gas | 1 |
Physics | 2 |
Quality control and standards | 1 |
Rail transport | 1 |
Seismology | 2 |
Technology | 10 |
Transport | 2 |