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.
形状和孔、槽的分布形式不同，其中心距定位尺寸的标注形式也不一样。
Since the basic shape of the board and the distribution of holes and grooves are different, the formats of location dimensions for dimensioning center-to-center spacing are also different.
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