GB/T 39969-2021建筑用通风百叶窗通风及防雨性能检测方法标准
英文:Test method of ventilation and rain resistance performance for ventilation louvers of building GB/T 39969-2021介绍: 国家标...
英文:Test method of ventilation and rain resistance performance for ventilation louvers of building GB/T 39969-2021介绍: 国家标...