[{"title":"( 4 个子文件 15.28MB ) 土木工程制图课件 经典 绝对好用","children":[{"title":"08土木画法几何","children":[{"title":"3-5 投影变换.ppt <span style='color:#111;'> 4.30MB </span>","children":null,"spread":false},{"title":"1-第一章 投影的基本知识.ppt <span style='color:#111;'> 1.73MB </span>","children":null,"spread":false},{"title":"3-第三章 直线与平面、平面与平面的相对关系.ppt <span style='color:#111;'> 4.08MB </span>","children":null,"spread":false},{"title":"4-第四章 曲线与曲面.ppt <span style='color:#111;'> 7.60MB </span>","children":null,"spread":false}],"spread":true}],"spread":true}]