The team fired a laser that detected metal atoms released from the rocket body made of aluminium-lithium.
13时37分，老爸在村里的微信群里发了语音求助，他不甘心丢下牛，“把你们大家都请上，牛娃栽到沟里上不来了，能帮上忙的来帮个忙。”
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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WPS下载最新地址