某同学在做“验证机械能守恒定律 的实验时采用如图所示的装置进行了如下一些操作 A.用天平称出重物的质量b.使用计时器打点时先放开纸带 Template




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tomski某同学在做“验证机械能守恒定律 的实验时采用如图所示的装置进行了如下一些操作 a.用天平称出重物的质量b.使用计时器打点时先放开纸带 coloring