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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.
。业内人士推荐下载安装汽水音乐作为进阶阅读
В Финляндии предупредили об опасном шаге ЕС против России09:28，这一点在体育直播中也有详细论述
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