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.
第一百四十三条 本法所称以上、以下、以内，包括本数。
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Александра Качан (Редактор)
，详情可参考搜狗输入法2026
Наука и техника，更多细节参见快连下载-Letsvpn下载
Jim Lovell, Fred Haise and Jack Swigert are rescued from the Pacific Ocean after their dramatic escape