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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.
以色列国防军发言人德夫林当地时间2月27日发表声明称，目前以军针对以色列民众的防御指南没有任何改变。