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外 管 螺纹 : 29 phrases in 9 subjects |
| Architecture | 2 |
| Automobiles | 2 |
| Aviation | 1 |
| Compressors | 2 |
| Drilling | 2 |
| General | 2 |
| Mechanics | 1 |
| Oil / petroleum | 4 |
| Technology | 13 |
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