The advice says this group should be screened every two years between the ages of 45 and 61.
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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Military reckoned ‘good’ Afghan insurgents were separate from ‘bad’ Pakistani insurgents but distinction has blurred，这一点在Line官方版本下载中也有详细论述
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Dynamic AMOLED 2X, 120Hz adaptive refresh (1–120Hz), Up to 2,600 nits peak brightness