In micrographics, a measure of the remoteness of the copy from the original material, the first microfilm representation being the first generation microfilm.
在缩微照相技术中,度量副本离原始资料远近程度。第一次缩微后胶片为第一代缩微胶片。
In micrographics, a measure of the remoteness of the copy from the original material, the first microfilm representation being the first generation microfilm.
在缩微照相技术中,度量副本离原始资料远近程度。第一次缩微后胶片为第一代缩微胶片。
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