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[单选题]
在n个产地、m个销地的产销平衡运输问题中，( )是错误的。
A
运输问题是线性规划问题
B
基变量的个数是数字格的个数
C
空格有m-n-m+1个
D
每一格在运输图中均有一闭合回路
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试题答案：
D
答案解释：
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