In this paper the relation between the hole diameter and the pile thickness of the jet on the holebottom for a jet penetrating or drilling process is theoretically examined.
本文在理论上探讨了射流在侵彻或钻孔过程中，孔径和射流在孔底的堆积厚度之间的关系。
2
The paper stated the water inrush model of shearing failure at the karst sink holebottom in North China coal field and analyzed the water inrush mechanism of the karst sink hole.
从论述华北型煤田岩溶陷落柱顶底部剪切破坏突水模式及判据入手，分析了井下溶陷落柱突水机理。
3
One of the first water clocks was a basin with a small hole near the bottom through which the water dripped out.