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.
（七）利用职务上的便利收受他人财物或者谋取其他利益的；
，更多细节参见夫子
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