I. Practical simulation Section : z=0 Section x=0 Section: y=0 a=0,b=1 1,c=1 Ck兀 B。S SIn 2 k C0 2 0 E 2 B sin sin iwt x c ck y z e k a a a        − =         Section: z=0 a=0, b=1 Section: y=0 a=0, c=1 Section: x=0 b=1, c=1 II. Practical simulation