补 焊 : 65 phrases in 15 subjects |
Agriculture | 1 |
Automobiles | 2 |
Chemistry | 1 |
Compressors | 2 |
Drilling | 2 |
Electric machinery | 1 |
General | 2 |
Metallurgy | 12 |
Oil / petroleum | 2 |
Plastics | 6 |
Rail transport | 3 |
Shipbuilding | 3 |
Space | 1 |
Technology | 25 |
Wind Energy | 2 |