Article 27 warning lights, warning marks or safety protection facilities shall be set up at a crossing where a railway and a road intersects on a plane.
第二十七条铁路与道路平面交叉的道口，应当设置警示灯、警示标志或者安全防护设施。
The method of this model suits not only road plane design, but also road profile design, crossing design, pipeline design, etc.
本模型的建模思想不仅适合于道路平面设计，今后还可应用于道路纵断面设计、横断面设计、管线综合等。
The crossing number of a graph is the minimum number of pairwise intersections of edges in a drawing of in the plane.
图的交叉数只在好画法中得到，好画法是指满足边自身不交叉，相关联的边不交叉，任意两条交叉的边至多交叉一次的画法。
应用推荐