题目内容

下列变量组是一个闭回路的有()。

A. (x11,x22,x34,x12,x24,x33)
B. (x11,x22,x24,x12,x31,x34)
C. (x21,x23,x12,x11,x32,x33)
D. (x11,x35,x42,x12,x43,x25,x23,x31)
E. (x33,x32,x12,x11,x21)

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有m个产地,n个销地,产销平衡的运输问题,m+n-1个变量构成基变量组的充要条件是它们不包含闭回路。

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