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| 螺纹管口; 螺纹端; 丝头 | |||
| threaded ends: 16 phrases in 8 subjects |
| Automobiles | 1 |
| Bridge construction | 1 |
| Drilling | 1 |
| Earth sciences | 1 |
| Mechanics | 4 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Technology | 5 |
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