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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Most people Gareth encountered while he was sleeping on the streets were kind, but he says some made critical comments and stole his possessions in the night.。爱思助手下载最新版本是该领域的重要参考
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