1) difficult mining copper deposit
难采铜矿床
1.
Research on mining method and optimization of mining preparation system in deep shaft complicated difficult mining copper deposit;
深井复杂难采铜矿床采矿方法及采准系统优化研究
2) Hard to mine iron deposit
难采铁矿床
3) Complicated and hard-to-mine deposits
复杂难采矿床
4) Low grade hard to mining and refractory copper ore
难采难选低品位铜矿石
5) hard mining and dressing oxidized copper ore
难采难选氧化铜矿
1.
The commercial scale trial of the mining technology of undergound leaching of hard mining and dressing oxidized copper ore in TongKuangyu Copper Mine was introduced (it was a key project in the 9th 5 year plan period).
文中介绍了铜矿峪铜矿难采难选氧化铜矿地下溶浸采矿工业试验 (“九五”重点攻关项目 )。
补充资料：难夫难妻(难ｎàｎ)
一名《洞房花烛》。故事片。亚细亚影戏公司1913年摄制。郑正秋编剧，张石川、郑正秋导演。一对素不相识的青年男女，经媒婆撮合拜堂成亲，在封建礼教桎梏下开始艰难的夫妻生活。为中国第一部故事片。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条