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。
In this paper the relation between the hole diameter and the pile thickness of the jet on the hole bottom for a jet penetrating or drilling process is theoretically examined.
该区的史前堆积主要是庙底沟文化遗存和半坡四期文化遗存。
Main deposit in the southern district were Miaodigou Cultural and Phase IV of Banpo Cultural remains.
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