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.
2025年，上证指数全年累计上涨18.41%，创最近6年来最大年度涨幅，创最近6年以来新高，上证指数最终报收3968.84点，深证成指全年上涨29.87%，创业板指全年上涨49.57%。北证50、科创综指年线分别上涨39.78%和46.30%。沪深300指数累计上涨17.66%。
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