The government rejected the claims, with a spokesperson saying it had already introduced "some of the strongest online safety protections in the world".
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.，详情可参考快连下载安装
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