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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.，更多细节参见safew官方下载
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员工安全意识培训同样不可忽视，人为因素往往是最薄弱的环节。
writes every transaction in a little booklet that the customer keeps? They were。服务器推荐对此有专业解读