汤姆生用如29所示的装置�现了电子电子由阴极c射出在ca间电场加速a上有一小孔所以只有一细束的电子可以通过p与p两平行板间的区域 Template




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tomski汤姆生用如29所示的装置�现了电子电子由阴极c射出在ca间电场加速a上有一小孔所以只有一细束的电子可以通过p与p两平行板间的区域 coloring