一、吉林省舒兰矿务局刘建明同志来信谈到本刊1988年第6期刊登的《建筑施工中钢筋代换的计算图》认为很实用,并询问该图的具体绘制。答:这种计算图又称作诺模图。它具有计算速度快、使用方便、不易出错等优点。它的绘制方法是根据数学原理,分为几何法及代数法两种,经计 I. Comrade Liu Jianming of the Shulan Coal Mine Bureau of Jilin Province wrote a letter referring to the “Calculation Diagram of Rebar Replacement in Construction” published in the 6th issue of 1988, and considered the concrete drawing of the map. A: This calculation chart is also called a nomogram. It has the advantages of fast calculation speed, easy use, and less error. Its drawing method is based on the principle of mathematics, divided into two kinds of geometric methods and algebraic methods.