很遗憾，因您的浏览器版本过低导致无法获得最佳浏览体验，推荐下载安装谷歌浏览器！
Our hanging-type scraper conveyor for backfilling uses solid material to replace the coal pillar left behind when they are mined. It can improved the recovery of coal mine, extend the service life of a coal mine, reduce the pollution and avoid the problems of land subsidence.
