long hole

常见例句

This paper describes the effects of bottom water cushion on long hole blasting.
本文论述了水垫层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.
完井污染状态下，射孔深度大于污染表皮半径时，射开多个短孔比射开一个长孔的开发效果要好。
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.
所述的套筒为一空心圆柱形筒，套筒的上、下两端分别设有加强箍，套筒上设置有纵向的腰形长孔。
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