At present, most of Ta-Nb ores are processed by use of gravity concentration, with which the recovery of fine-grained Ta-Nb mineral is very low.
目前钽铌矿的选矿多以重选为主，但重选法选别细粒钽铌矿的回收率非常低。
At present several formulae for calculating oxygen fugacities on the basis of fluid inclusion da-ta and corresponding diagrams and tables have been proposed by some researchers.
目前，某些研究者推出几种流体包裹体的氧逸度计算公式和相应的图表。
The present thesis is an attempt to explore the correlation between TA and IVA.
因此，本文试图探讨阅读中的模糊容忍度与词汇附带习得效果的关系。
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