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It is regularly contacted by probation services requesting free sleeping bags and food parcels for those released from prison with nowhere to go.。搜狗输入法2026是该领域的重要参考
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.