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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Европейские страны пытались помешать самолету ключевого российского переговорщикаРИА: ЕС пытался помешать пролету борта Дмитриева после переговоров в Женеве。关于这个话题，旺商聊官方下载提供了深入分析
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