说明：  基于Gumbel极值分析的腐蚀剩余寿命估计过程中，Gumbel分布图的绘制程序。该程序在论文“储罐底板机器人在线检测数据的极值分析”有应用。
(Gumbel distribution graph plotting code for corrosion residual life estimation. The program is applied in the paper Extreme Value Analysis of In-Service Robotic Storage Tank Floor Inspection .)