在学习无产阶级专政理论运动的推动下,江苏省吴县开展了森林资源调查工作。调查中利用现有的万分之一地形图作基本图。在透绘丘陵山区时,为了加快速度,使等高线不与小班界线混淆,采用中华牌晒图铅笔描绘等高线(计曲线用HB,一般等高线用2-3H,使之 Under the impetus of studying the theoretical campaign of proletarian dictatorship, Wu County, Jiangsu Province, conducted a forest resource investigation. Survey using the existing ten thousandth topographic map as a basic map. In penetrating hills and mountains, in order to speed up, so that contour lines are not confused with the small class boundaries, the use of Chinese licensing sun map pencil depicting contours (gauge curve with HB, the general contour with 2-3H, so that