long hole

基本解釋

This paper describes the effects of bottom water cushion on long hole blasting.
本文論述了水墊層在深孔爆破中的作用。
When total length of perforation must, perforating a long hole is better than perforating several short holes.
完井污染狀態(tài)下，射孔深度大于污染表皮半徑時，射開多個短孔比射開一個長孔的開發(fā)效果要好。
The sleeve is a hollow cylindrical sleeve; reinforced hoops are respectively arranged on the upper end and lower end of the sleeve; a vertical waist-shaped long hole is arranged on the sleeve.
所述的套筒為一空心圓柱形筒，套筒的上、下兩端分別設(shè)有加強(qiáng)箍，套筒上設(shè)置有縱向的腰形長孔。
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