质量为m的木块从半径为r的竖直圆轨道上�下�动由于�擦力的作用木块的速率保持不变则在这个过程中 A.木块的加速度为零b.木块所受的 Template




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tomski质量为m的木块从半径为r的竖直圆轨道上�下�动由于�擦力的作用木块的速率保持不变则在这个过程中 a.木块的加速度为零b.木块所受的 coloring