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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In April 1970, it was Jim Lovell's turn. Fortunately, the crew of Apollo 13 did not believe in unlucky numbers.
《行政执法监督条例》已经2025年12月5日国务院第74次常务会议通过，现予公布，自2026年2月1日起施行。