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当前学科：第三章运输产品
题目：
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在一定区域范围内，对同类运输对象不论运输距离长短，都制定相同的运价。这种运价结构叫()
A . 基点式运价结构
B . 成组运价结构
C . 复合运价
D . 邮票式运价结构
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