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aperture diaphragm /ˌantɪfɹˈɪkʃən ˈpad/ n

中文：孔径光阑

中文 · 孔径光阑Español · abertura del diafragmaFrançais · diaphragme d’ouverture
Meaning：Device with an opening whose diameter can be changed to narrow or widen the diameter of the electron beam.
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Electron microscope cross-section

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