Some smoke alarms have been designed to be ultra-sensitive. Aspirating devices, for example, constantly suck in air in order to detect even small quantities of smoke in a room. They are often used in commercial settings, including server rooms packed with expensive computer tech.
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习近平同志深刻指出：“‘三把火’该不该烧，什么时候烧适宜，都要从实际出发。”“要多深入群众，多做调查研究，弄清事情的来龙去脉，而后审时度势，该烧则烧，不该烧决不要赶时髦，勉强‘烧火’。”，更多细节参见搜狗输入法下载
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