受弯承载力及裂缝验算(水工规范)，采用mathcad做的水工计算规范，适合土木设计、规划院-Flexural capacity and crack Checking (hydraulic specifications), use of hydraulic calculations do mathcad specification for civil engineering design, Planning Institute

改程序用于绘制误差椭圆，是测绘、土建行业中分析问题、精度叫常用的工具。-Change the program used to draw error ellipse is a mapping, civil engineering industry, analysis of issues, often called the precision tools.

AutoCAD字体 JJS.shx,土木工程钢筋符号的标注字体-The AutoCAD fonts JJS.shx, reinforced symbols marked font Civil Engineering