第三十二条 增值税优惠政策的适用范围、标准、条件等应当依法及时向社会公开。
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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.