Дарья Устьянцева (редактор отдела «Мир»)
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.
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You can share your real-time location via Google Messages now - here's how。关于这个话题，搜狗输入法下载提供了深入分析
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