columbite

There is high tantalite grade for certain large scale granite - pegmatite pattern tantalite - columbite mine in our country.

我国某大型花岗伟晶岩型铌钽矿含钽品位高居我国钽铌矿山之首.

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The measurement indicates that the optimized performance can be achieved by three - element composite columbite precursor methods.

性能测试结果表明,三组元复合先驱体法制成样品的性能最佳.

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