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| 金刚石取心钻头 | |||
| 金刚石岩心钻头 | |||
| 金刚石取芯钻头 | |||
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diamond core bit : 10 phrases in 4 subjects |
| Metallurgy | 2 |
| Oil / petroleum | 3 |
| Space | 1 |
| Technology | 4 |
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