This paper introduces one accurate drawing method for working condition diagram to provide the operator of power plant with reliable basis.

The concept of h-v drawing of a binary tree is described.

The crossing number of a graph is the minimum number of pairwise intersections of edges in a drawing of in the plane.

In this paper, designers are expected to better understand and grasp the drawing methods by showing the forming of perspective drawing method through analysis of perspective system.

In this paper,the drawing method of the tapered roller bearing is discussed.

This paper dicusses the simple drawing method of internal force diagram of the simple drawing method of internal force diagram of the forced pole.

A teaching system of descriptive geometry based on AutoCAD;

Research on teaching reform of descriptive geometry and architectural drawing;

A electronic teaching-system to descriptive geometry based on AutoCAD;

The difficulties of making shadows of solids,especially for revolved objects by using traditional method,are pointed out and a new method is put forward.