With crawler, it is easy and fast to find out the drill hole position.
采用履带行走机构，移动孔位方便，快捷。
Change the position of any one small hole.
改变任意一个小孔的位置。
The center of circle is the position of the centre hole for positioning.
该圆周的圆心即定位的中心孔位置。
The center of circle is the position of the centre hole for positioning.
该圆周的圆心即定位的中心孔位置。
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