如图是某同学利用两个光电门传感器测量小车的加速度的实验情景关于光电门传感器的作用下面的两种说法正确的是a.a.光电门能够测出挡光片经过光电门 Template




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tomski如图是某同学利用两个光电门传感器测量小车的加速度的实验情景关于光电门传感器的作用下面的两种说法正确的是a.a.光电门能够测出挡光片经过光电门 coloring