Medical research
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.
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Цены на нефть взлетели до максимума за полгода17:55
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日产表示，此次新增加的黑金双拼外观与黑红内饰工艺比较复杂，合计约 1.5 万元，但为了展示诚意，上市价格最终定为 16.19 万元。。同城约会对此有专业解读