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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.，推荐阅读旺商聊官方下载获取更多信息
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backend systems. Ultimately, as so often happens, it may have been IBM's success。关于这个话题，旺商聊官方下载提供了深入分析
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