Президент России Владимир Путин провел совещание с членами Совета безопасности. Об этом сообщает РИА Новости.
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，这一点在谷歌浏览器【最新下载地址】中也有详细论述
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Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.