如图所示在曲轴a上悬挂一个弹簧振子如果转动把手b上的曲轴可以带动弹簧振子上下振动问1开始时不转动把手而用手往下拉振子然后放手让 Template




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tomski如图所示在曲轴a上悬挂一个弹簧振子如果转动把手b上的曲轴可以带动弹簧振子上下振动问1开始时不转动把手而用手往下拉振子然后放手让 coloring