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第一设计院动力科去年曾去信给苏联“动力工作者”杂志编辑部,请求介绍热力管道绝热材料经济厚度的计算资料,下面是回信副本的全文。
Last year, the Dynamo Department of the First Design Institute sent a letter to the editorial department of the Soviet Union “Power Workers” magazine asking for the calculation of the economic thickness of heat pipe thermal insulation material. The full text of the reply copy is as follows.