The comparison between the matrix method and Gauss formula;

It reminds the learners to notice the formula premise when using Gauss Formula,to avoid obtain a wrong result.

Combined with practical engineering,this paper discusses controlling factor and treatment method of deflection in the process of cantilever construction of large-span PC continuous rigid frame bridge,and carries out proper amendment of theoretical height formula,which to offer a reference for relevant problems.

Form the formula of air pressure and height, the thesis analysed and discussed the theory of construction and the method of calibration of ghe box air pressure theight meter and the new vest-pocket electronic height meter.