DIN EN ISO 6946 E:2015 文件草案 建筑构件和建筑构件 热阻和热透射率 计算方法（ISO/DIS 6946:2015）
Draft Document - Building components and building elements - Thermal resistance and thermal transmittance - Calculation method (ISO/DIS 6946:2015); German and English version prEN ISO 6946:2015