以无穷远直线为基础讨论二阶曲线的中心、直径、渐近线等几个仿射概念，并联系解析几何中的有关性质，深入讨论它们之间的一致性。
Based on the infinitely straight line, this thesis discusses the concepts of curve of second orders center, diameter, advance gradually in the line.
对林分结构研究表明，不同发育阶段的林分林木直径分布呈左偏单峰山状曲线，林木株数随径阶变化可以分为四个阶段；
It was found out that the value of the stand DBH at the succession stages appeared to be inclined to left side mountain-liking curve.
本文在分析二阶绕射势产生机理的基础上，提出了二阶绕射势的解析解，从而得到了作用于大直径圆柱上二阶波浪力的协调表达。
On the basis of analysing the mechanism of generation of second-or-der diffraction potential, an exact solution is proposed in this paper.
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