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.
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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