发布时间:2025-01-29 13:56:21
每平米的玻璃,两侧温度每改变1度时所消耗的能量,就是玻璃的K值,单位为w/m2k。U值与K值的意思是一样的,一般的国内用K值,欧洲用U值
防水的闭水试验做多久 闭水试验需要进行多长时间能判定防水性能
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