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【单选题】
2019年1月3日,嫦娥四号探测器经历了地月转移、近月制动、环月飞行后,成功着陆在月球背面。设嫦娥四号环月飞行时做匀速圆周运动,已知其到月球中心距离为r,运动周期为T,月球半径为R,引力常量为G.则( )
A.
嫦娥四号环月飞行的线速度
B.
月球质量
C.
月球的密度为
D.
月球表面重力加速度
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B.
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A.
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