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> 2012年6月24日中午12时，神舟九号飞船与天宫一号进行了手动交会对接。若“天宫一号”M和“神舟九号”N绕地球做圆周运动的示意图如图所示，虚线为各自轨道。由此可以判定 A．M、N的运行速率均小于7.9km/s B．M的周期小于N的周期 C．M运行速率大于N的运行速率 D．N必须适度加速才有可能与M实现对接

问题：

发布时间：2020-03-13

2012年6月24日中午12时，神舟九号飞船与天宫一号进行了手动交会对接。若“天宫一号”M和“神舟九号”N绕地球做圆周运动的示意图如图所示，虚线为各自轨道。由此可以判定

A．M、N的运行速率均小于7.9km/s

B．M的周期小于N的周期

C．M运行速率大于N的运行速率

D．N必须适度加速才有可能与M实现对接

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