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There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.，推荐阅读体育直播获取更多信息
В России спрогнозировали стабильное изменение цен на топливо14:55，更多细节参见谷歌浏览器下载
Loveholidays poised to delay £1bn London IPO after Gulf travel chaos