多级互连网络中如果令居于上方的都用i表示,居于下方的都用j表示,以下四种开关错误的是()
A.直连,即i入连i出,j入连j出
B.上播,即j入连i出和j出,i入悬空
C.交换,即i入连j出,j入连i出
D.下播,即j入连i出和j出,i入悬空
正确答案是B
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