21.下列说法正确的是 A 做匀速圆�运动的物体处于平衡状态 b 做匀速圆�运动的物体所受的合外力是恒力 c 做匀速圆�运动的物体的速度 Template




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tomski21.下列说法正确的是 a 做匀速圆�运动的物体处于平衡状态 coloring