Nathan Heath,BBC West Investigations
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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Line官方版本下载作为进阶阅读
照顾好自己：只有情绪稳定的父母，才能给孩子安全的依恋。