设Σ为上半球面x2 y2 z2=R2(z≥0,R>0),f(x,y,z)在Σ上连续,且f(r, y,z)= R-r 设Σ为上半球面x2 y2 z2=R2(z≥0,R>0),f(x,y,z)在Σ上连续,且f(r, y,z)= R-r 发布时间:2025-07-03 03:35:14