GB/T 39749-2021中空玻璃隔热保温性能评价方法及分级标准
英文:Evaluation method and graduation for energy efficiency performance of insulating glass unit GB/T 39749-2021介绍: 国家标准《中...
英文:Evaluation method and graduation for energy efficiency performance of insulating glass unit GB/T 39749-2021介绍: 国家标准《中...