Nb:Sn17%A1565%EDSXPSNb:SnLD[nf（t_{ext{Nb}}t_{ext{Sn}}）=left|frac{Ntext{Sn}}}-3ight|][t_{ext{Nb}}^{（k+1）}=t_{ext{Nb}}^{（k）}-alphacdotfrac{partialf}{partialt_{e[t_{ext{Sn}3Nb2SnNb:Sn3.1:10.1Tc17KJc910Ac6~cp99+yuycpyuycp..