The support method of cutting hole in Dongrong No.
介绍了东荣三矿切眼支护方式。
But various cutting inner hole and small Angle cutting.
可切割各种内孔及小角度切割。
Drilling is cutting a hole with a drill.
钻削就是用钻头钻一个孔。
Drill hole, Cutting, Stretch or punch (Range 3-5 mm).
钻孔，切割，拉伸或冲压(幅度3 - 5毫米)。
Drill hole, Cutting, Stretch or punch (Range 3-5 mm).
钻孔，切割，拉伸或冲压(幅度3 - 5毫米)。
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