下列关于向心力的说法中正确的是 ( ) A . 做匀速圆周运动的物体其向心力是不变的 B .向心力不改变圆周运动物体的速度大小 C .物体 所受指向圆心的某个力 D . 做圆周运动的物体所受各力的合力一定是向心力
A.
B.
C.
D.
D
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