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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.
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3014272610http://paper.people.com.cn/rmrb/pc/content/202602/28/content_30142726.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/28/content_30142726.html11921 助残障人士有事干、干得好（实干显担当 同心启新程·代表委员履职故事）