以下为句子列表：
英文: According to the characteristics of pinnoite in Dachaidan, a new technology of preparing boric acid with two-step sulfuric acid method was studied.
中文: 摘要针对大柴旦柱硼镁石矿特点，对酸法制硼酸进行了工艺优化研究。
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英文: Methods The menthol and hydroxybenzene in complex boric acid powder were determined by GC.
中文: 方法采用毛细管气相色谱法测定复方硼酸散中薄荷醉和苯酚的含量。
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英文: Objective To establish a method to determine the content of menthol and hydroxybenzene in complex boric acid powder.
中文: 摘要目的建立测定复方硼酸散中薄荷醉和苯酚含量的方法。
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英文: In this paper,it is shown that the direct Sulphuric acid method for producing boric acid with some areas ulexite in Tibet. its percent recovery of single circulation is 8.09%. and its purity conform to GB 8-8.
中文: 本文以西藏某地钠用解石矿为原料，利用酸法一步直接制取硼酸产品，硼酸单程收率达8．09％、产品纯度达GB 8－8指标。
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英文: Preparation of boric acid from ulexite
中文: 采用钠硼解石生产硼酸的工艺研究
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