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.
统一管理：适配原有权限治理体系
，这一点在同城约会中也有详细论述
Authentication (overall)48%
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04