第3章 形体上几何元素的投影分析3.1 根据平面的一个投影，用彩笔描绘其三面投影，并在立体图上用相应符号表示出该平面，然后完成填空P1． P平面P 垂直 于正面、 倾斜 于水平面、 倾斜 于侧平面2． RRRRRRRRr平面R 倾斜 于正面、 倾斜 于水平面、 倾斜 于侧平面Q3． Q平面Q 倾斜 于正面、 垂直 于水平面、 倾斜 于侧平面4．SS平面S 垂直 于正面、 平行 于水平面、 垂直 于侧平面 3.2 判别平面的空间位置，并填写该平面的名称1． 平面A是 侧平 面，平面B是 一般位置 面2． 平面C是 水平 面，平面D是 侧垂 面3．平面G是 正平 面，平面F是 正垂 面4． 平面Q是 铅垂 面，平面R是 水平 面3.3 对照立体图看懂三视图，并在三视图中用彩笔描绘立体图上指定平面的投影线框或图线1．AA2．BB3．CC4．DD续题3.3 5．EE6．FF7．GG8．HH3.4 对照立体图看懂三视图，在三视图中用彩笔描绘立体图上指定线段的三个投影，并填写直线的名称。
A1．直线A是 正平 线B2．直线B是 正垂 线C3．直线C是 铅垂 线4．D直线D是 侧垂 线E5．直线E是 水平 线F6．直线F是 侧平 线3.5 根据立体图，补全三视图中所缺图线1．2.3.4．5．6． 2.6 根据立体图，在三视图中完成：（1）由点A、 点B的已知投影a′、b′和a″、b″，求作投影a、b；（2）补全俯视图中所缺的图线（3）填空ACBPDDCAPB直线AB是 一般位置 线；直线AC是 侧垂 线；直线AD是 正垂 线；平面P是 正垂 面点A位于点B之 上（上、下）、之 右（左、右）、之 后（前、后）2.7 对照立体图，完成：（1）根据已知的两个视图，单独画出Q面的水平投影；（2）标出点A、B、C、D三面投影符号；（3）填空ADBCDQCASDBQ直线AB是 一般位置 线；直线AC是 侧垂 线；直线CD是 一般位置 线；平面Q是 侧垂 面点A、B、C、D中，最前点 B、D 、最上点A、C 、最右点 D 。
3.8 根据立体图和主视方向，按尺寸单独画出指定平面或直线的三面投影，并填空1．平面A该平面是 侧平 面， 正面、水平 投影有积聚性、 侧面 投影反映实形 续题3.82．平面B该平面是 侧垂 面， 侧面 投影有积聚性、 正面、水平 投影不反映实形3．直线C该直线是 侧垂 线， 侧面 投影有积聚性、 正面、水平 投影反映实形4．直线D 该直线是 水平 线， 正面、侧面 投影没有积聚性、 水平 投影反映实形Acknowledgements My deepest gratitude goes first and foremost to Professor aaa , my supervisor, for her constant encouragement and guidance. She has walked me through all the stages of the writing of this thesis. Without her consistent and illuminating instruction, this thesis could not havereached its present form. Second, I would like to express my heartfelt gratitude to Professor aaa, who led me into the world of translation. I am also greatly indebted to the professors and teachers at the Department of English: Professor dddd, Professor ssss, who have instructed and helped me a lot in the past two years. Last my thanks would go to my beloved family for their loving considerations and great confidence in me all through these years. I also owe my sincere gratitude to my friends and my fellow classmates who gave me their help and time in listening to me and helping me work out my problems during the difficult course of the thesis. My deepest gratitude goes first and foremost to Professor aaa , my supervisor, for her constant encouragement and guidance. She has walked me through all the stages of the writing of this thesis. Without her consistent and illuminating instruction, this thesis could not havereached its present form. Second, I would like to express my heartfelt gratitude to Professor aaa, who led me into the world of translation. I am also greatly indebted to the professors and teachers at the Department of English: Professor dddd, Professor ssss, who have instructed and helped me a lot in the past two years. Last my thanks would go to my beloved family for their loving considerations and great confidence in me all through these years. I also owe my sincere gratitude to my friends and my fellow classmates who gave me their help and time in listening to me and helping me work out my problems during the difficult course of the thesis.班级： 姓名： 学号： ·9·。