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的程度。次缩微后的胶片代缩微胶片。
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的程度。次缩微后的胶片代缩微胶片。
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