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.
“短短一周，连着两次诈骗，我意识到诈骗团伙可能已经盯上我妈了。”龙先生告诉记者，母亲年纪大了，听力不太好，说话需要很大声，所以母亲虽然在隔壁打电话，他听得很清楚。。WPS官方版本下载对此有专业解读
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Lex: FT’s flagship investment column。旺商聊官方下载是该领域的重要参考