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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.。safew官方下载是该领域的重要参考
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A few months pass, and Erika decides to clean up their credential manager. They don’t remember why they had a specific passkey for a messaging app and deletes it.