The methods,which are demonstrated in the prac- tice of drafting parallel axonometric contour,central axonometric conto- ur and invisible shadow of curved surface,are concise,accurate and pra- ctical.

• 在绘制曲面的平行轴测投影轮廓线、中心轴测投影轮廓线以及曲面的阴影的实践中证明,其方法简捷、准确、实用性强。