表面硬化: 142 phrases in 22 subjects |
Agriculture | 3 |
Architecture | 6 |
Automobiles | 6 |
Aviation | 1 |
Business | 5 |
Compressors | 1 |
Desert science | 1 |
Drilling | 7 |
Electronics | 5 |
General | 8 |
Mechanics | 2 |
Metallurgy | 41 |
Nautical | 1 |
Oil / petroleum | 6 |
Plastics | 2 |
Rail transport | 1 |
Refrigeration | 1 |
Shipbuilding | 2 |
Space | 1 |
Steel production | 2 |
Technology | 35 |
Wind Energy | 5 |