《现代机械制图(第2版)》习题答案第3章.doc

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。4SS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。1AA2BB3CC4DD续题3.3 5EE6FF7GG8HH3.4 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4D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。12.3.456 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.