工程制图基础-直线的投影2abXoabZYHbaYWbbbaaaoXZYHWVAB34a(b)abbaBA0WHVXZYXYWZYH0a(b)abba5XYWZYH0abbaa(b)a(b)baBA0WHVXZYab6YWZYH0aba(b)a b Xa(b)Wa BA0HVXZYb ab789XaboabZYHbaYWXbbbaaaoZYHWVAB10YbbbaaaoZHWVABXXababZYHbaYWo11XababZYHbaYWobbbaaaZHWVABXYo12BAabZAZB-ZAZBZB-ZAZB-ZAXoabba13abcabcX0abcabcX0VHACB141516abcdkkabcdX0XabcackbBACDKddVH17bkXOaabcdcdk181(2)34123(4)abcdabcdX0abcdabcd1(2)3413(4)2X0ABCDVH19abcabcX0abcabcXABCVH2021