Extraction condition, optimal formula, sediment prevention, etc. are studied in the experiments.

试验中探讨了浸提条件，最佳配方以及防止沉淀等问题。

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It is very significant extracting niobium, tantalum from tungstenic slag. The extraction method and the computational formula of it are given out in this paper.

从钨矿渣中提取铌、钽具有重要的意义。本文给出了提取方法及相应的计算公式。

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Optical Formula Recognition is not only the sign of formula recognition, but also include the extraction of the formula, the record of two dimension structure of the formula and so on.

数学公式的识别不仅只是公式中符号的识别，其还包括了公式抽取，公式二维结构的记录等方面的研究。

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