耐久性：一般外保温层和建筑物应同寿命，使用年限也要在几十年以上。
Durability: general insulation layer and the building should be with life, use fixed number of year will in a few years.
从寿命经济学观点出发，讨论了工业炉热风管道最佳保温层厚度的问题。
From the view of life cycle and economics the optimum insulation thickness of hot air pipes in industrial furnaces is discussed.
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