Фото: Bernadett Szabo / Reuters
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.。同城约会对此有专业解读
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Жители Санкт-Петербурга устроили «крысогон»17:52
His mother, Blanche, worked all hours, struggling to keep food on the table. University was well beyond their financial reach.