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一、填空题１封套片是将１６或３５ｍｍ条片装入透明塑料胶套中制成的缩微品。２将缩微胶片固定在开窗卡片窗口上的方法主要有贴边式和袋装式两种。３胶片的透光度是透射光通量与入射光通量之比。４光谱（光学）增感剂的主要作用是扩大感光材料感光光谱范围。５银盐
First, fill in the blank title 1 envelope film is a 16 or 35mm strip into transparent plastic plastic sleeve made of microfilm. 2 The microfilm fixed in the window card window methods are mainly two kinds of welt-type and bagged. 3 Film transparency is the ratio of transmitted flux and incident flux. 4 Spectral (Optical) The main role of sensitizers is to expand the photosensitive spectral range of photosensitive materials. 5 silver salt