28.某同学利用光电门传感器设计了一个研究小物体自由下落时机械能是否守恒的实验实验装置如图所示图中ab两位置分别固定了两个光电门传感器 Template




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tomski28.某同学利用光电门传感器设计了一个研究小物体自由下落时机械能是否守恒的实验实验装置如图所示图中ab两位置分别固定了两个光电门传感器 coloring