18.如图所示a为静止于地球赤道上的物体b为绕地球做椭圆轨道运行的卫星c为绕地球做圆�运动的卫星p为bc两卫星轨道的交点.已知ab Template




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tomski18.如图所示a为静止于地球赤道上的物体b为绕地球做椭圆轨道运行的卫星c为绕地球做圆�运动的卫星p为bc两卫星轨道的交点.已知ab coloring