[填空题]
One means of enrichi ec5 r;x2d*t)gprg0/kncq z8 y tj:+whc vw4,gi/lza(8 n pq,wng uranium is by diffusion of the gas $\text{UF}_6$. Calculate the ratio of the speeds of molecules of this gas containing $_{92}^{235}\text{U}$ and $_{92}^{238}\text{U}$ on which this process depends. :1