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| 金刚石钻头取心; 金刚石钻进取心 | |||
| 金刚石取芯 | |||
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diamond coring : 8 phrases in 5 subjects |
| Drilling | 2 |
| Engineering geology | 2 |
| Mechanics | 1 |
| Oil / petroleum | 2 |
| Technology | 1 |
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