The rock drill is indispensable for digging coal mines.
凿岩机是煤炭采掘不可缺少的工具.
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Disassamble the rock drill and inspect the wear, replace worn part.
拆开冲击器,检查磨损情况, 更换磨损件.
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Mini rock drill has been produced based on patented technology for rock drill warm extrusion.
采用钎头壳体温挤压精密成形专利技术生产了小型凿岩钎头.
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