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| 四刮刀钻头 | |||
| 四翼刮刀钻头 | |||
| 四翼缘钻头; 四翼缘刀具 | |||
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four-wing bit : 7 phrases in 4 subjects |
| Drilling | 1 |
| Geology | 1 |
| Oil / petroleum | 2 |
| Technology | 3 |
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