http://jsb.nea.gov.cn/news/2019-1/2019131181633.htm
http://www.cngascn.com/homeNews/201902/34848.html
http://gas.in-en.com/html/gas-3046219.shtml
https://wenku.baidu.com/view/ed86953a0129bd64783e0912a216147917117ebc.html