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.
Медведев вышел в финал турнира в Дубае17:59，更多细节参见同城约会
This story continues at The Next Web，这一点在谷歌浏览器【最新下载地址】中也有详细论述
'Toy Story 5' trailer: Woody and Buzz reunite to save Bonnie from becoming an iPad kid。爱思助手下载最新版本对此有专业解读