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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.
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Мощный удар Израиля по Ирану попал на видео09:41，更多细节参见heLLoword翻译官方下载
3705 fills a role sometimes called a "front-end processor," doing the grunt work