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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63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54，推荐阅读WPS官方版本下载获取更多信息
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