单选题:商品流通过程中商流、物流、信息流的结构属于商品流通网络中(  )的层次。

题目内容:
商品流通过程中商流、物流、信息流的结构属于商品流通网络中(  )的层次。 A.点
B.线
C.面
D.体

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上行下给式管网方式具有的特点有(  )。

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