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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The success of the test means project leaders are considering scrapping plans to flood 900 acres (364 hectares) of farmland in Gloucestershire, which was initially proposed to provide a compensating habitat for fish.。业内人士推荐旺商聊官方下载作为进阶阅读
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