字词 | 顿钻 |
释义 | 顿钻 dùn zuàn {机} (冲击钻) percussion drilling; American system drill; cable-system drill; churn drill 顿钻机 percussion drilling rig; 顿钻钻井 churn drilling; percussion drilling; cable tool drilling; 顿钻钻头 chopping bit |
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