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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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Let our team of writers be your guide to the cricketing world, as they analyse the big stories, revisit the week’s matches and other happenings, and look further afield. Sign up below to start receiving The Spin in your inbox. View the latest edition here.。WPS下载最新地址对此有专业解读
Water and dust resistance rating
Schovsbo, opens a box to show me a grainy green slab drilled from the seafloor.