单选题：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（　　）

题目内容：
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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答案解析：

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