Penetration performance in surface layer of concrete target was analyzed by stress wave damage theory, calculating method base on "simplified equivalent resistance line" was presented.
从应力波表层损伤理论分析了混凝土表层“开坑区”的侵彻特性，提出“简化等效阻力线”的计算方法；
The general formula of the equivalent resistance of ladder type network are achieved with elementary method, and some relevant problems are discussed.
用完全初等的方法给出了梯形电阻网络等效电阻的通项公式，并对相关问题进行了讨论。
This paper, using cutting method, calculated the equivalent resistance of any two points of the circuit in the normal hexahedron.
本文用剖割的方法计算了正六面体电路任意两端子间的等效电阻。
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