拥有四条通路的转盘路口排队模型模拟。相邻路口的弧形段假设为一容量有限的队列。到达为泊松分布，不考虑车长的堵塞影响-Four channels have lined up at the junction of the turntable model. Paragraph of the arc adjacent to the junction is assumed to be a queue with limited capacity. The reach follow the Poisson d

对于分层地质条件，用于圆弧滑动法中求解圆弧所包含的土壤层数。-For layered geological conditions, used in circular arc sliding method for solving circular arc contains the number of layers.

自动实现 弧长的标注，vba文件。学习vba的实例-自动实现 弧长的标注

系统建模描述语言，可实现基于模型的安全性、可靠性分析(Model based language)