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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heLLoword翻译官方下载作为进阶阅读
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James also hears from Catherine and Jo, who have lived with ME for many years. They describe their diagnostic journeys and how they manage their symptoms in their daily lives.
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