短语词组短语coal dust mill 磨煤机coal pulverizing mill 粉煤机;煤磨Two Coal Pulverizing Mill 投两台磨煤机BBD coal ball mill 直燃式双进双出磨煤机coal grinding mill 磨煤机Coal crusher mill 磨煤机medium speed coal mill 中速磨煤机low speed coal mill 钢球磨煤机 返回 coal mill