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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高效序列化与反序列化：加速数据流转
不止茶饮，中式快餐行业也都进入了个性化、客制化时代。五年前我提出，中式快餐只有自选模型能立足。如今，非自选类中式快餐业绩普遍下滑，而老乡鸡、乡村基等老牌连锁还在增长，正是因为满足了消费者“丰俭由人”的需求。，更多细节参见夫子