Drawinginstruments sre used to make the drawing in which the three principal axes make equal angles with the plane of projection.
它用绘图仪器绘画，三主要轴线与投影面所成的角相等。
2
Lay out plate, sheet steel or other heavy metal and mark bending and cutting lines on work piece using protractors, compasses and drawinginstruments or templates.
铺设莱板，钢板或其他重金属，用量角器，圆规和绘图工具或模板在工件上标记弯曲和切割线。
3
Digitized cadastral map is drawn with drawinginstruments after data′s collection with electronic theometer and electronic automatic recording in the field and editing graphic indoors.