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.
描写槽孔位置标签增加了。
第一件事，你想要做的就是钻一个先导孔在正确的位置。
First thing you want to do is drill a pilot hole in the right location.
标注出对面支柱的孔洞位置，并打钻出三个孔。
Mark location of the holes for the opposite leg and drill three more holes.
顶棍孔尺寸及位置是否正确?。
三种小孔在相对应的孔内位置上，换热增强差别亦很大。
The enhancement of heat transfer varies greatly in the same position of three different holes.
采用专用胎具焊接芯骨以保证铸孔的位置精度；
Special pattern was used to weld core iron to guarantee position accuracy of cast holes;
采用专用胎具焊接芯骨以保证铸孔的位置精度；
Special pattern was used to weld core iron to guarantee position accuracy of cast holes;
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