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| 牙轮钻头装有两个或多个圆筒形成硬质钢或碳化钨硬质合金牙轮的旋转钻头。有多种形式，如双锥钻头、三锥钻头、四锥钻头等 | |||
| roller rock bit: 7 phrases in 3 subjects |
| Drilling | 4 |
| Oil / petroleum | 2 |
| Technology | 1 |
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