与"focus forming unit"相近的词条

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• focus film distance、focus-film distance
• focus-film distance lock pin
• focus formation
• focus forming
• focus forming cell
• focus forming unit
• focus foxal point
• focus-grid
• focus indicator
• focus inducing cell
• focus lamp
• focus mapping
• focus mask、focus-mask
• focus nidus
• focus object distance
• focus of excitation

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