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| 放置岩芯提断器的钻头内锥度; 钎头磨刃角 | |||
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bit taper : 13 phrases in 6 subjects |
| Architecture | 1 |
| Aviation | 1 |
| Construction | 1 |
| Engineering geology | 1 |
| Oil / petroleum | 2 |
| Technology | 7 |
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