There is high tantalite grade for certain large scale granite - pegmatite pattern tantalite - columbite mine in our country.
我國某大型花崗偉晶巖型鈮鉭礦含鉭品位高居我國鉭鈮礦山之首.
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The measurement indicates that the optimized performance can be achieved by three - element composite columbite precursor methods.
性能測試結(jié)果表明,三組元復(fù)合先驅(qū)體法制成樣品的性能最佳.
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