DIN ISO 20189 E:2020 文件草案 声学 室内使用的屏幕、家具和单个物体 基于实验室测量的元件吸声和隔音评级(ISO 20189:2018) 文本为德语和英语
Draft Document - Acoustics - Screens, furniture and single objects intended for interior use - Rating of sound absorption and sound reduction of elements based on laboratory measurements (ISO 20189:2018); Text in German and English