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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尽管如此，在很多消费者心中，部分精选服务品牌酒店（比如万豪万枫酒店）依然承担着“刷房”的角色。