This paper firstly corrects a wrong result given by refernece [1],then gives the edge spans of L(2,1)-labeling and lambda-L(2,1)-labeling of the above two kinds of graphs,so the moving communication frequency assignment problem is completely solved.

The definition of (0,1) -edge span is proposed and some precise values of several famous graphs are listed.

Arch pipe is a long-span structure made with bending and welding steel tube which is characterized by no requirement of the arch hinges.

When the customer as well as the manufacturers selects the ADSS types, besides considering the fiber numbers of ADSS, sometimes they define ADSS type based on span.

The influences of span on the motion stability of chains were discussed, and the relationship among chain sags, chain lengthes and chain numbers was studied, and the reasons for tooth-leap were analyzed, and a new-style device preventing tooth-leap was provided.

Combined with the specific project example,it analyses the affecting factors of the construction of continuous rigid frame joint section and the construction requests,specifically introduces the construction technology of the side span,middle span joint section of continuous rigid frame,to perfect the construction technology of joint section,and this can supply good reference to related projects.

This main span box beam of cable_stayed bridge construction adopted the methods of precasting and putting pieces together, and the side span box beam construction adopted the methods of casting_in_place to concrete piecewise.

The article puts forward that (1) the continuous beam has the side span, and the area of the main span is large; (2) the height of the continuous beam is large, and the area of the bridge in the whole line is large under the condition of the equal longitudinal slope; (3) the different types of the bridges are relatively to the critical point of the technical and econom.