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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.，推荐阅读旺商聊官方下载获取更多信息
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В Финляндии предупредили об опасном шаге ЕС против России09:28，更多细节参见搜狗输入法2026
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