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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It is a peculiarity particular to Crystal Palace that a season of such upheaval and unrest could still end up with Oliver Glasner’s side winning another trophy. Having left the pitch after last week’s first leg with supporters calling for the Austrian manager to be sacked in the morning, Maxence Lacroix and Evann Guessand made it a much more harmonious evening for Glasner and his side.，推荐阅读体育直播获取更多信息
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