In interviews while onboard, Butch and Suni have said they were well prepared for their longer than expected stay - but there were things they were looking forward to when they got home.
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.,这一点在爱思助手下载最新版本中也有详细论述
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Никита Абрамов (Редактор отдела «Россия»)