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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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2008年，一个关键转折点出现：管理着两家医院的Sun Health，被亚利桑那州最大的非营利医疗系统Banner Health收购。这意味着，Sun City的医疗服务，从“社区主导”正式转向“专业化管理”。，推荐阅读一键获取谷歌浏览器下载获取更多信息
2024年12月25日 星期三 新京报