对于绘制教学挂图中的象形符号和几何符号,一般多采用三角板或直尺,并使用直线笔和毛笔绘画着色。这种方法,成图速度慢,绘画技能要求高,花费时间也多,花费劳力很大,仍难绘画出规格一致、颜色协调的符号。使用印号法,印制符号,简易方便,一般人只需了解制印办法,便可操作。此法事半功倍,印制图形整齐美观,色调宜人。 For drawing the pictograms and geometric symbols in the wall charts, the general use of triangular or ruler, and the use of straight lines and brush painting coloring. This method, drawing speed, painting skills require high, spend more time, laborious, it is still difficult to draw a consistent specification, color coordination symbols. The use of printed method, printed symbols, simple and convenient, most people only need to understand the printing method, you can operate. This method will do more with less, printed graphics neat appearance, color and pleasant.