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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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However, its then chair, Rijal, has denied in court that he authorised live rounds.。业内人士推荐搜狗输入法下载作为进阶阅读
音頻加註文字，中國調查解放軍最高級將領張又俠 學者：對「台灣問題」和現代化有深遠影響事件影響：軍心、台灣
Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08