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通讯员章顺德来信询问复印件寿命,现请国家档案局科研所刘毅峰同志根据其研究结果回答如下:
Correspondent Zhang Shunde wrote a letter asking for the longevity of his copy. Now, please ask Comrade Liu Yifeng of the State Bureau of Archives, based on the results of his research, the following reply: