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However, the company said on Tuesday the offending notification would have only been seen by a small number of users and that it was removed quickly.。关于这个话题，safew官方版本下载提供了深入分析
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.