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| 空心钻 | |||
| 取心钻头 | |||
| 空心钻头 | |||
| 岩心 〔取心〕钻头 | |||
| 岩心钻头 | |||
| 岩芯钻头; 空心钎头 | |||
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hollow bit : 8 phrases in 3 subjects |
| Engineering geology | 2 |
| Metallurgy | 1 |
| Technology | 5 |
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