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| 锥形钻头 | |||
| 牙轮钻头 | |||
| 锥形金刚石不取芯钻头 | |||
| 锥形无岩芯钻头 | |||
| cone bit: 54 phrases in 5 subjects |
| Drilling | 14 |
| Engineering geology | 4 |
| Mechanics | 6 |
| Oil / petroleum | 17 |
| Technology | 13 |
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