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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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李 “나와 애들 추억묻은 애착인형 같은 집…돈 때문에 판 것 아냐”。快连下载-Letsvpn下载是该领域的重要参考
As the spacecraft re-emerged from the darkness, Lovell was first to announce the good news. "Please be advised," he said as the radio crackled back into life, "there is a Santa Claus."