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| bottoming bit; collapsible bit; knock-off bit | |||
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| rip bit | |||
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| detachable bit | |||
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可 卸钻头 : 22 phrases in 5 subjects |
| Engineering geology | 1 |
| General | 1 |
| Oil / petroleum | 3 |
| Shipbuilding | 1 |
| Technology | 16 |
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