光电门是一种可以测量物体瞬时速度的器材它利用的基本原理是极短时间内的平均速度大小可以�似认为是该时刻的瞬时速度大小.光电门的基本结构如图a Template




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tomski光电门是一种可以测量物体瞬时速度的器材它利用的基本原理是极短时间内的平均速度大小可以�似认为是该时刻的瞬时速度大小.光电门的基本结构如图a coloring