试题与答案

调车人员在车上看枕木(轨长12.5m铺18根枕木)观速时,能较慢地数清枕木根数时,车

题型:单项选择题

题目:

调车人员在车上看枕木(轨长12.5m铺18根枕木)观速时,能较慢地数清枕木根数时,车辆走行速度约()km/h。

A、3

B、4

C、5

答案:

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