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.
«Во второй половине недели будет ночная температура минус 2, минус 7, и около ноля днем. Ни одна весна не обходится без возврата холодов. Перестройка только начинается. Вот это потепление у нас происходит за счет проникновения теплых воздушных масс с Атлантики», — сказала синоптик.，更多细节参见雷电模拟器官方版本下载
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