在研究宇宙发展演变的理论中,有一种学说叫做“宇宙膨胀说”,这

在研究宇宙发展演变的理论中,有一种学说叫做“宇宙膨胀说”,这种学说认为万有引力常量占在缓慢减小,根据这一理论,在很久以前,太阳系中地球的公转情况与现在相比                                                           

       A.公转半径R较大                              B.公转周期T较大

       C.公转速率V较小                              D.公转角速度较大

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