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four section cut
expl.
四面打孔
一种在竖井或巷道钻孔的方式。指在距离一个大的中心孔等距离处钻四个孔,四个孔可连接成一个正方形,此后再旋转45。,在上面的四个孔以外较大的距离处再同样钻四个孔
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