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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按照计划，到 2027 年底，东风日产将共计推出 6 款全新新能源车型（包括已上市的 N7 和 N6），目标是将新能源车的销量占比提升至 50% 以上，并实现年出口量 10 万辆。