下图中AOB是赤道的其中一段,A点位于B点的正西方,APB刚好等于地球

下图中AOB是赤道的其中一段,A点位于B点的正西方,APB刚好等于地球的半径,且赤道上AOB属于312日,其余赤道地区为313日。回答

此时北京时间为       

A3130                         B3128

C31316                        D31216

答案

C

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