Example3.Point C from W 5mm,from V10mm,fromH10mm.point D from W15mm,from V10mm,from H5mm.construct three projections of point C.D and distinguish its visibility. 已知C点距W面5mm、距V面10mm、距H面10mm,D点距W画 15mm、距V面10mm、距H面5mm,求CD二点的三面投影并判别其可见 b'd' 5 0 15 10 Steps作图步骤： a (c) 1.Construct projections C,c,c,c"; 求点的三投影c,c',c”。 2.Construct projections D,"; 求D点的三投影d,d”,d”。 请点击围标左键显示后面内容8 b' A B 5 10 10 15 10 5 d Steps 作图步骤： 2. Construct projectionsD, d, d ' ,d "; 求D点的三投影d、d ' 、d" 。 1. Construct projections C , c, c',c"; 求C点的三投影 c、c' 、c" 。 请点击鼠标左键显示后面内容 C D (c) Example3. Point C from W 5mm, from V10mm, fromH10mm. pointD from W15mm, from V 10mm, from H 5mm.construct three projections of point C.D and distinguish its visibility. 已知C 点距W 面5mm、距V 面10mm、距H 面10mm, D点距W 面 15mm、距V 面10mm、距H 面5mm，求C、D 二点的三面投影,并判别其可见 性。 a' a" x 0 Y w Y H z b" a b c' c" d" ( )d