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.
The false positives at the bottom
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Медведев вышел в финал турнира в Дубае17:59，更多细节参见im钱包官方下载
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目前，已排除邱某酒驾、毒驾嫌疑，事故正在进一步依法调查处理中。