中国矿产资源供需矛盾的原因 �总量虽丰富而人均占有量低 �富矿�贫矿多加之开采中采富弃贫使矿产品品位下降 �矿产资源的地区分布不平衡 Template




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tomski中国矿产资源供需矛盾的原因 �总量虽丰富而人均占有量低 �富矿�贫矿多加之开采中采富弃贫使矿产品品位下降 coloring