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.
Раскрыты подробности похищения ребенка в Смоленске09:27
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The 9,000-pound monster I don’t want to give back。搜狗输入法2026对此有专业解读
endSync() { closed = true; return totalBytes; },