m个产地,n个销地,且产销平衡的运输问题具有的特征有( )。
A.有mn个变量,m+n个约束
B.有m+n个变量,mn个约束
C.有mn个变量,m+n-1个约束
D.有m+n-1个基变量
E.系数矩阵的秩等于m+n-1
正确答案是ADE
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