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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Americans are destroying Flock surveillance cameras。业内人士推荐旺商聊官方下载作为进阶阅读
在鹊巷村，杜耀豪（后排右三）与外祖母弟弟林木通的遗孀（前排右三）及后代。（受访者供图）