安徽快三走势图

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安徽快三走势图DIANHUA:15320015883

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便携式测氡仪使用需知

为了您能正确使用测氡仪以及避免因操作不当给您的人身安全造成威胁,使用者须知:以下须知中提到的内容,请您切忌尝试!... [查看全文]

氡污染的来源

室内环境中的氡主要有以下几个来源: 1、来自于地下地基土壤。地基土壤的扩散,通过地表和墙体裂缝而进入室内; 2、来自于地下水。研究证明,水中氡浓度达到104贝克/立方米时,便是室内的重要氡源;... [查看全文]

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