多选题：计算运输网密度的恩格尔系数时，需要考虑的指标有（　　）。

题目内容：

计算运输网密度的恩格尔系数时，需要考虑的指标有（　　）。 A．人均运输网密度
B．单位国民生产总值运输网密度
C．单位面积运输网密度
D．运输通道网密度
E．运输干道网密度

参考答案：

答案解析：

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