单选题:运输需求的波动性是指运输需求量在(  )上呈现出的不均衡状态。

题目内容:
运输需求的波动性是指运输需求量在(  )上呈现出的不均衡状态。 A.线路分布
B.时间分布
C.地区分布
D.运输方式分布
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