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Цены на нефть взлетели до максимума за полгода17:55
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.，推荐阅读heLLoword翻译官方下载获取更多信息