'I'm going to stick at it until I get a home'
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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Within weeks of publicly announcing their next stage production, Murray contacted the company.
影石创新：美国 337 调查终裁获胜，在美正常销售
A concept image of NASA's Fission Surface Power Project