用自由落体仪测量重力加速度通过电磁铁控制的小铁球每次从同一点a处自由下落下落过程中依次经过并遮挡两个光电门bc从而触�与之相接的光电 Template




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tomski用自由落体仪测量重力加速度通过电磁铁控制的小铁球每次从同一点a处自由下落下落过程中依次经过并遮挡两个光电门bc从而触�与之相接的光电 coloring