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.
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
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（三）其他破坏网络正常经营秩序的行为。