短语词组短語coal dust mill 磨煤機coal pulverizing mill 粉煤機;煤磨Two Coal Pulverizing Mill 投兩台磨煤機BBD coal ball mill 直燃式雙進雙出磨煤機coal grinding mill 磨煤機Coal crusher mill 磨煤機medium speed coal mill 中速磨煤機low speed coal mill 鋼球磨煤機 返回 coal mill