valid formula
3.Thirdly, 122 valid questionnaires are received, which was from 100 enterprises that at Tie Xi New Industrial District in ShenYang, China. By applying SPSS statistics software and AMOS structure equation model analysis software, the auther analyzes above basic cooperation variables and effective factors. The structure formula path is achieved from study.
4.It is showed by Galilean transformation of Euler’s formula that the flow type offluid will be different in different reference systems．As Bernoulli’s equation is valid only inreference systems in which ideal fluid flows in steady flow type，it is important to select aproper inertiai reference system in dealing with hydrodynamics problems such as Magnus ef-fect.
