The airsurvey is specially superior in the regional environmental radioactivity survey, which is recommended by IAEA.
在区域环境放射性测量中，航测具有特殊的优势，是IAEA推荐的手段。
2
Its mainly used in airsurvey, aviation remote sensing, satellite sea observation, astronautics reconnaissance, picture match guidance and so on.
主要用于航空测量、航空遥感、卫星海洋观测、航天侦察、图像匹配制导等。
3
In 2016, only one fourth of Chinese cities met the country's air quality standards, according to a survey of 338 cities nationwide from the Ministry of Environmental Protection.