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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.
走进山西电力交易大厅，记者看到屏幕上实时显示火电出力量、风光发电量等数据。
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实施前款行为，妨害反恐怖主义工作进行，违反《中华人民共和国反恐怖主义法》规定的，依照其规定处罚。，更多细节参见同城约会
Jonathan Head,South East Asia correspondentand