青藏铁路是世界上海拔最高的铁路,在建设过程中最不利的自然因素

青藏铁路是世界上海拔最高的铁路,在建设过程中最不利的自然因素是(   

A.空气稀薄         B.高原峡谷众多         C.太阳辐射过强          D.冻土层深厚

答案

D

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