And then studied the origin and lithofacies meaning of siderite.在此基础上研究了菱铁矿的成因和岩相意义.The lithofacies - paleogeographical environment is the most important ore - control factor.岩相古地理沉积环境是湖北锰矿最重要的控矿因素.The main controlling f...
差不多要在同时使挖泥机, 驳船和索斗铲各就各位.We should have the dredge, barges and draglines in place about the same time.工程不得包括挖泥及卸泥工序.No dredging and spoil dumping shall be allowed.用于堆焊齿轮 、 挖泥斗 、 拖拉机刮板 、 矿山机械等磨损件.For surfacing welding the ...