 |
| |||
| normal weld | |||
| 标准焊接: 6 phrases in 6 subjects |
| Aviation | 1 |
| Electronics | 1 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Technology | 1 |
|
| |||
| normal weld | |||
| 标准焊接: 6 phrases in 6 subjects |
| Aviation | 1 |
| Electronics | 1 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Technology | 1 |