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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当萨吉德·阿克拉姆离开桥面时，他被一名路人扑倒并缴械。这名路人后来被证实是一名从未接触过枪支的水果店主，网络上涌现大量赞扬他英雄行为的评论，美国总统特朗普也称赞他“非常非常勇敢”。
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