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| 无岩心钻头; 爆破孔钻头 | |||
| 钻炮孔用金刚石钻头 | |||
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| 爆破孔钻头; 炮眼钻 | |||
| blast hole bit: 2 phrases in 2 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Technology | 1 |
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