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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。体育直播对此有专业解读
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Niki Sharma, B.C.'s attorney general, said the change is "a long time coming."，详情可参考im钱包官方下载