【摘要】 通过对平面立体投影图形的系统分析，对教科书中未予明确揭示或说明的平面立体面面交线性质进行了系统的归纳和总结，使得平面投影与直线投影之间的联系变的更加直观和具体。较好地掌握和运用归纳出的面面交线性质，对于绘图和读图都将带来极大的好处，具有一定的理论价值和应用价值更多还原

【Abstract】 Through an analysis of the system of the dimensional plane projecting figure,a systematic induction and summary of the features of the dimensional plane interfacial lines which are not explained in the text books were given.Thus the relationship between the plane projecting figure and lines becomes more visualized.A better command of this method will be greatly beneficial to drawing and comprehension. This method is of some theoretical value and application value.更多还原