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.
——“扎扎实实、踏踏实实地搞现代化建设”。WPS下载最新地址是该领域的重要参考
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在開始實驗前，我以為自己因為懂法語、還有基礎西班牙語，葡萄牙語應該學起來得心應手。相反地，中文對我來說陌生到不能再陌生。
1L decoder, d=7, 1h, ff=14。safew官方下载对此有专业解读