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| 梯形钻头; 带锥形接头的可卸式钻杆; 带锥形接头的可卸式钎杆; 锥形钻头 | |||
| tapered bit: 9 phrases in 3 subjects |
| Drilling | 1 |
| Oil / petroleum | 2 |
| Technology | 6 |
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