根据气体炮的工作原理和特点，建立了其内弹道数学模型，推导了实用的气体炮内弹道方程的解法。
Based on the principle and the characteristics of the gas-gun, the mathematical model of the interior ballistic is constructed and the practical interior ballistic equations of gas gun are derived.
因此对该类问题的研究提供了新的实用的数值解法和数值分析方法。
Therefore, a new and functional numerical method and quantitative analysis method are provided.
介绍用图解法设计排洪沟的实用经济断面，此法可达到快速、优化设计的目的，并且具有通用性好，形象直观的特点。
It introduces a diagram method for design of flood discharge trench utility section, which is more universal and vivid and can attain the goal of quick& optimized design.
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