In this paper, a polar coordinate drill-rod lifter was developed to strictly control drill rod in order to precisely locate the rod.
作者研制了极坐标扶钎器可以严格的控制钎杆，从而保证孔位准确。
In this paper, a polar coordinate drill-rod lifter was developed to strictly control drill rod in order to precisely locate the rod.
作者研制了极坐标扶钎器可以严格的控制钎杆，从而保证孔位准确。
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