Furthermore, the paper also describes the charge shapes, the differential time and the guide hole stemming.
对药包形态、微差时间、导硐堵塞也作了描述。
A numerical model of bottom-hole assembly was developed and the differential equations of finite element for its dynamic analysis were derived.
建立了底部钻具组合动态分析的数值模型，推导了动态分析的有限元微分方程。
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