以往采用投影作图法确定岩石组构要素优选方位。
Preferred orientation of rock fabric elements is usually recognized by projecting and plotting contours.
所绘交线与理论形状的投影作图十分接近，可以满足工程制图的要求。
The drawn intersecting line is similar to the shape of its theoretical projection and can satisfy the requirement of engineering drawings.
组合体的投影作图，一直是学生在学习画法几何和工程制图当中的一大问题。
The projection drawing of assembly has been a big headache for stu dents when learning techniques of geometry drawing and engineering drawing.
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