题目内容

T1718_2_07.假设卫星环绕地球中心作圆周运动，则在运动过程中，卫星对地球中心的

A. 角动量守恒，动能也守恒．
B. 角动量守恒，动能不守恒．
C. 角动量不守恒，动能守恒．
D. 角动量不守恒，动量也不守恒．

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