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| 活钻头 | |||
| 可拆式钻头 | |||
| 可拆卸式钻头; 可卸式鑽頭 | |||
| 可拆开钻头; 可拆卸钻头 | |||
| 可拆卸的钻头 | |||
| 可拆卸钻头; 可拆卸式钻头; 活络钻头; 活动钻头; 可卸式钻头 | |||
| detachable bit: 7 phrases in 3 subjects |
| Engineering geology | 2 |
| Oil / petroleum | 1 |
| Technology | 4 |
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