Two different thickness calculation formulas of ellipse head presented in the "Application Manual of calculation Standard of Boiler Strength" was analyzed, and a united formula was put forward.
对《锅炉强度计算标准应用手册》中出现两个不同椭圆封头壁厚计算公式进行分析，并提出一个统一的公式。
2
Unfortunately I can't create a nice shadow using the "standard way" - ellipse tool, that's why I will use the Brush tool.
不幸的是我不太会使用“标准方法”——椭圆工具，去创建一个好看的阴影。因此我会使用画笔工具去画阴影。
3
This thesis does some research on the developing and applying of Ellipse and its Standard Equation based on the theory of instructional design.