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.
据官方数据，星巴克在海南地区的春节假期营收同比增长超过 20%，表现显著高于往年节庆周期。
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2024年12月20日 星期五 新京报
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