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Tanzania Tanzania
联系人 tikri fibre
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Lithium is�a soft, silvery-white, metal that heads group 1, the alkali metals group, of t
Copper cathode is�a form of copper that exhibits purity of more than 95%. It is the prima
Copper ore is�a mineral deposit that contains copper in concentrations high enough to be
Cobalt is�a lustrous very hard silvery metal belonging to a group called the "transi
Coltan is�short for columbite-tantalite, a dull metallic ore. When refined, coltan become
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