亚洲欧洲日产无码中文字幕丨亚洲日本香蕉视频丨av国产剧情md精品麻豆丨亚洲区日韩精品中文字幕丨性欢交69国产精品丨欧美永久免费丨制服丝袜有码中文字幕在线丨无码ol丝袜高跟秘书在线观看丨看中国毛片丨色噜噜亚洲精品中文字幕丨性高爱久久久久久久久丨欧美日韩在线精品丨99蜜桃在线观看免费视频网站丨麻豆视传媒在线观看丨乌克兰少妇xxxx做受丨日韩精品欧美激情丨亚洲图片欧美激情丨91视频 - 114av丨中文字幕av一区二区三区丨av天天在线丨天天综合天天爱天天做丨人人狠狠综合久久亚洲丨麻批好紧日起要舒服死了丨欧美人动与zoxxxx乱丨三级国产99久久

With the increase of global environmental problems, the electric vehicle has become development trend of car and one of the hotspots, but the charging mode become the focus in the development process of electric vehicle. 

The air pollution in the big cities already can't be ignored, car emissions is one of the main pollution sources, 16 cities in China had been already listed as the most serious global air pollution in 20 cities.  oil resources isn't enough, hundreds of millions of tons of oil had been imported each year, with the development of economy, oil import will become a big problem.  So electric vehicle (EV) now had become development trend and one of the hotspots because of its good environmental protection, energy-saving characteristics.