Последние новости
但好饭不怕晚，从各种爆料来看，这次三星终于给出了久违的硬件更新。
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Фото: Кирилл Каллиников / РИА Новости
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.