如图,是一段平直的铁轨,某天小明站在距离铁轨100米的A处,他发

如图,是一段平直的铁轨,某天小明站在距离铁轨100米的A处,他发现一列火车从左向右自远方驶来,已知火车长200米,设火车的车头为B点,车尾为C点,小明站着不动,则从小明发现火车到火车远离他而去的过程中,以A、B、C三点为顶点的三角形是等腰三角形的时刻共有(  )
 
A.2个      B.3个     C.4个     D.5个

答案

D解析:

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