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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tomski28.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