一、问题的提出笔者在某中学版的学习报上看道一道关于振动的题目:荡秋千的人为了使秋千越荡越高,下列做法效果最好的是().A.总是当秋千荡到最低点时将人的重心提高,荡到最高点时将人的重心降低B.总是当秋千荡到最低点时将人的重心降低,荡到最高点时将人的重心提高C.当秋千荡到 First, the problem raised I read in a high school version of the study reported on the topic of vibration: swinging people in order to make the swing higher swing, the following best practice is () A. always swing Swing to the lowest point will increase the focus of the people, swinging to the highest point will be the center of gravity lower B. Always fall when the swing swing to the lowest point of the human heart, swinging to the highest point will be the center of gravity to improve C. When the swing swing