5年来，832个脱贫县均培育形成了2至3个优势特色突出、带动力强的主导产业，总产值超1.7万亿元。
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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.