The percussion-rotary drilling technique is one of the most effective drilling methods. It has made a great progress in recent years.
冲击旋转钻进技术是一种高效的碎岩方法，近年来随着施工领域的拓宽取得了很大的进步。
The percussion-rotary drilling technique is one of the most effective drilling methods. It has made a great progress in recent years.
冲击旋转钻进技术是一种高效的碎岩方法，近年来随着施工领域的拓宽取得了很大的进步。
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