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| 钻头导向器 | |||
| 钻头导向器环; 钻头领眼部分 | |||
| 钻头导向器 (不取芯金刚石钻头中央凸出端部) | |||
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bit pilot : 23 phrases in 5 subjects |
| Drilling | 1 |
| Engineering geology | 4 |
| Oil / petroleum | 4 |
| Space | 1 |
| Technology | 13 |
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