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| 碳化钨钻头 | |||
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| 硬合金钻头; 碳化钨合金钻头 | |||
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tungsten- carbide bit : 25 phrases in 4 subjects |
| Drilling | 1 |
| Mechanics | 1 |
| Oil / petroleum | 6 |
| Technology | 17 |
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