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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换句话说，中国游艇产业过去之所以规模有限，并不是因为制造能力不足，而是因为需求土壤尚未形成。。关于这个话题，91视频提供了深入分析
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