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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For a second time, Jim Lovell had brought the world together as one. The first time it had been for Earthrise, the second would be to witness his fight to survive.
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Известно, что книга была снята с продажи в связи с рисками появления претензий со стороны правоохранительных органов. «Голубое сало» было впервые опубликовано в 1999 году.
Мощный удар Израиля по Ирану попал на видео09:41，这一点在下载安装 谷歌浏览器 开启极速安全的 上网之旅。中也有详细论述