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.
The US military mistakenly shot down a Customs and Border Protection (CBP) drone near the Mexican border in a strike that reportedly used a laser-based anti-drone system. The CBP uses drones to track people crossing the border.，推荐阅读爱思助手下载最新版本获取更多信息
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04，推荐阅读heLLoword翻译官方下载获取更多信息
All of the new products are Marine Stewardship Council (MSC) certified.