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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.，详情可参考旺商聊官方下载
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On the Co-op Live experience itself, some concert-goers have raised concerns about parking and queuing.。关于这个话题，爱思助手下载最新版本提供了深入分析