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URL title: 防火窗与耐火窗的发展与现状
URL description: 防火窗的使用有较长的历史,最早的防火窗是钢质防火窗，其技术指标依据GB16809-1997《钢质防火窗》，对窗扇自动关闭并不做指标要求，但有隔热性要求。
URL keywords: 防火窗，耐火窗
URL last crawled: 2022-05-24
URL speed: 0.096 MB/s, downloaded in 0.200 seconds

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