The most of the figure symbols of the current unified standard of architectural drawing are proper and there are distinctions between those.
通过分析发现，现行建筑制图标准中的图形符号绝大部分在大小和形状具有适宜性、区分性。
2
Geological symbols generally have the specific graphical features and geological significances and can be used to present some concrete or abstract objects in geological drawing.
地质符号一般均有其特定的图形特征和表示意义，用以表达地质制图中所涉及的具体或抽象的地质对象。
3
A statistic and structure integrated approach for recognizing all kinds of symbols on engineering drawing is presented. It achieves a good recognition result.