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Жители Санкт-Петербурга устроили «крысогон»17:52
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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.，推荐阅读下载安装 谷歌浏览器 开启极速安全的 上网之旅。获取更多信息
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