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| pipe threading | |||
| pipe thread; pipe worms | |||
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管 子螺纹 : 24 phrases in 9 subjects |
| Chemistry | 1 |
| Compressors | 1 |
| Drilling | 1 |
| Earth sciences | 1 |
| Mechanics | 3 |
| Nautical | 1 |
| Oil / petroleum | 5 |
| Shipbuilding | 2 |
| Technology | 9 |
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