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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伟大梦想的实现是一场永不停歇的接力跑，既需要自身本领高强，也需要时时加油补给，更需要大家勠力同心。从一个个温暖片段里读懂深沉期盼、汲取奋斗力量、校准前进航线，我们一定能齐心共进，抵达梦想彼岸。，详情可参考旺商聊官方下载
* @param {ListNode} head 链表的头节点。搜狗输入法下载是该领域的重要参考