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| 底面排水 (钻头) | |||
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| 底冲式的 | |||
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| 底冲式金刚石取心钻头; 唇喷射式钻头 | |||
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face discharge : 8 phrases in 5 subjects |
| Electronics | 1 |
| Engineering geology | 2 |
| Mechanics | 2 |
| Oil / petroleum | 1 |
| Technology | 2 |
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