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| 转盘补心; 方钻杆补心; 小补心; 补心高度; 方补心 | |||
| 转盘补芯 | |||
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rotary bushing : 14 phrases in 4 subjects |
| Drilling | 9 |
| Earth sciences | 1 |
| Oil / petroleum | 1 |
| Technology | 3 |
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