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平天窗是建筑屋面采光的一种形式,随着建筑技术的不断发展,平天窗在各种不同类型的工业与民用建筑中得到越来越广泛的应用。众所周知,建筑采光是衡量建筑使用功能的一项十分重要的性能指标,在我国《工业企业采光设计标准》（ＴＪ３３-７９）及其他现行有关标准、规范中对采光等
Flat roof window is a form of roof lighting, with the continuous development of building technology, flat roof windows in a variety of different types of industrial and civil buildings have been more widely used. As we all know, architectural lighting is a measure of the function of building a very important performance indicators in our country, “Industrial Enterprise Lighting Design Standards” (TJ33-79) and other relevant current standards and norms on lighting and other