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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据上海发布2月28日消息，2026上海全球投资促进大会暨“投资上海”活动周将于3月14日正式开幕。本届大会以“春启申城·创领未来”为主题，主会场设在中国对外开放新地标—上海东方枢纽国际商务合作区。大会期间将举办“1+2+N+X”系列活动，包括：1场高规格主推介会，全方位展示上海“十五五”重点发展方向和投资机遇；两场政企圆桌会，推动科技创新企业、重点外资企业等深度交流；N场洽谈对接活动，设立“投资上海会客厅”，促进政府、企业、投资人一站式深入对接；X场主题招商活动，市区联动推介主导产业特色政策，展现产业链集聚发展的优势。