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| 牙轮钻头 | |||
| 旋转钻头 | |||
| 旋转钻 (头); 旋转刀片; 回转钻进钻头 | |||
| rotary bit: 20 phrases in 5 subjects |
| Drilling | 1 |
| Engineering geology | 2 |
| Geology | 1 |
| Oil / petroleum | 2 |
| Technology | 14 |
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