题目

He often talks to his c on the computer 答案：【1】customers某球状行星质量分布均匀、密度为ρ，当此行星自转周期为T时，其赤道上的物体恰能飘浮．球体的体积V与半径r的关系为V=，万有引力常量为G，则（ ）A．T=B．C．D．