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1.Discussion on the Methods and Network of Ore Productive Prospecting in Lala Copper Mine
拉拉铜矿生产探矿手段与网度探讨收藏指正
2.(of a mine or oil well) drilled speculatively in an area not known to be productive.
（指矿井或者油井）在不知道是否能产的地方盲目的钻井。收藏指正
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