Types of Projection投影法分类 Central projection method中投影法 (The central projection is mainly used for the pictorial drawings of buildings.一般多用于建筑图样) Projection method 投影法 VP. Parallel projection method平行投影法 It is used in most engineering drawings 广泛用于机械、电子、化工等行业的图样) 请点击鼠标左键显示后面内容3