一弹簧振子作简谐运动则下列说法中正确的是 A. 若位移为负值则速度一定为正值加速度也一定为正值 B. 振子通过平衡位置时速度为零 Template




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tomski一弹簧振子作简谐运动则下列说法中正确的是 a. 若位移为负值则速度一定为正值加速度也一定为正值 coloring