The black rock series in the Muchang formation of Lower Cambrian contains abundant NiMoV polymetallic deposits and associated precious metal mineralizations in northwest Hunan.
湖南西北部下寒武统木昌组黑色岩系中蕴藏着丰富的镍钼钒多金属矿床及其伴生的贵金属矿化。
As a precious metal powder, ultrafine silver powder and silver series powder is widely used in light, electricity, magnetism, heat and catalysis areas.
超细银粉及银系粉末作为贵金属粉末，在光、电、磁、热以及催化等领域具有广泛的应用。
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