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环螺栓 : 56 phrases in 14 subjects |
| Architecture | 2 |
| Automobiles | 2 |
| Compressors | 1 |
| Drilling | 6 |
| Electric machinery | 3 |
| Electronics | 1 |
| General | 2 |
| Mechanics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Shipbuilding | 1 |
| Steel production | 2 |
| Technology | 31 |
| Textile industry | 2 |
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