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aperture changer /ˈaŋkəl ˈɡɑːd/ n

中文：孔径转换器

中文 · 孔径转换器Español · abertura para el cambio de gasesFrançais · commande de sélection de l’ouverture
Meaning：Device that adjusts the diaphragm opening in order to change the diameter of the beam.
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Electron microscope cross-section

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