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Methods Salicylic acid and acetic anhydride were used as the raw materials, with concentrated sulfuric acid as the catalyst.

目的 建立乙酰水杨酸的快速合成方法。

Acetic anhydride was a very important chemical raw material, which was widely used in many fields of the national economy. There were more preparation methods for acetic anhydride, however, using coal into an important chemical materials was the states key research project.

醋酸酐是非常重要的化工原料，广泛的运用于国民经济多个领域，制备方法比较多，但利用煤炭转化为重要的化工原料是国家重点研究项目。

Company BDO is the world's most advanced to calcium carbide acetylene butanediol as raw material production facilities.

公司BDO是全球最先进的以电石乙炔为原料的丁二醇生产装置。

Reasonable ratio of raw materials, so that fat soybean fatty acid and phospholipid ratio of more reasonable and improve the utilization of extruded soybean.

合理的原料配比，使大豆脂肪中不饱和脂肪酸和磷脂的比例更合理，提高了膨化大豆的利用率。

It is reported that phosphate rock raw material for the production of phosphoric acid, phosphate rock the world's total reserves of about 45.78 billion tons.

据悉，磷矿是生产磷酸的原料，目前世界磷矿石总储量约457.8亿吨。

The results showed that after acidification of the raw material after the preparation of Fe2O3 Desulfurization of better performance.

结果发现经过酸化后的Fe2O3原料所制取的脱硫剂脱硫性能较好。

Results The examination of raw materials, sterilization, fermentation, cryopreservation, processing device, containers, packing materials and asceptic manipulation were the main factors influencing the hygienic quality of acidophilus milk.

结果 确定原料验收、杀菌、发酵、冷藏、加工设备、容器及包装材料的消毒、灌装环境和无菌操作是影响酸牛乳卫生质量的主要原因，为关键控制环节。

With the raw material of glucose and catalyst of amide, the technology of the preparation of acidproof caramel color was studied.

对以葡萄糖为原料，复合氨基化合物为催化剂制备耐酸型焦糖色素的工艺进行了研究，在单因素实验基础上，通过正交实验得出较好的工艺条件为糖液浓度60%、保温温度145℃、保温时间3h、催化剂用量5%，得到色率达163626，带负电荷的耐酸焦糖色素产品。

Acidproof raw starch-digesting glucoamylase ; Aspergillus fumigates ; properties of enzyme ; fermentation condition

耐酸生淀粉糖化酶；烟曲霉；酶的性质；发酵条件

Finally, the problems to be resolved about raw materials, low cost, design and evaluation in ACM were discussed.

最后，重点讨论了复合材料的原材料技术、低成本技术、设计／评价一体化技术等亟待解决的问题。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。