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optical wedge
光楔
由含染料、或胶态碳、或银的凝胶制作成的,呈现一系列不同密度的,并且其相邻两级的密度差是固定的、准确已知的、能够给出一系列精准的不同曝光量的消色标准片。又称标准光楔、级谱、光学劈。
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optical wedge
光楔
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world geodetic system 1984
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World Heritage Training and Research Institute for the Asia and Pacific Region
World Heritage Volunteers Initiative
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