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.
When do I need a split keyboard?
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Раскрыты подробности похищения ребенка в Смоленске09:27，更多细节参见Line官方版本下载
* @param n 数组长度，更多细节参见safew官方下载
Not the day you're after? Here's the solution to yesterday's Connections.