第十八条 国家推动建立和完善与原子能发展相适应的设备研制生产体系，鼓励和支持企业形成自主研发、设计、制造能力。
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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Scott spent 20 years at Tottenham until leaving two years ago after a clash with the then manager, Ange Postecoglou, who was in charge of Forest for eight matches this season.，更多细节参见旺商聊官方下载
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