提出了制作透镜电极时保持轴对称、特别是限制光栏必须位于透镜光轴上的必要性。
The necessity of the lens electrode coaxality especially the coaxality of the aperture with lens axis is emphasized.
提出了制作透镜电极时保持轴对称、特别是限制光栏必须位于透镜光轴上的必要性。
The necessity of the lens electrode coaxality especially the coaxality of the aperture with lens axis is emphasized.
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