查询词典 preparation period

Resolution and preparation of ethofumesate enantiomers were achieved under the optimal semi-preparation conditions. The chemical structure of two elutes were identified by GC-MS, the optical property and the eluting order were determined by using the Circular Dichroism detector and polarimeter.

在优化的半制备色谱条件下，完成了乙氧呋草黄对映体的拆分、收集和制备，两个组分的化学结构经GC-MS确证，光学性质和流出顺序用圆二色检测器和旋光仪进行测定，获得了光学纯度超过97%的左旋和右旋对映体。

The preparation of epoxides by reaction between alkyl peroxides and olefins catalyzed by high-valent transition metal complexes is one of the most important means of preparation of epoxides.

以高价过渡金属配合物为催化剂，催化烯烃直接环氧化反应是合成环氧化合物的重要途径之一。

By the studying of the course, the students should understand the relationship of structures and properties of polymeric composite materials, preparation technology, investigation method, structure morphologies, mechanical properties and application of polymeric composite materials. The students should have basic knowledge on polymer materials and filler, fiber for polymeric composites material preparation..

通过本课程的学习，使学生理解填料填充、玻璃纤维增强高性能聚合物基复合材料的结构与性能的关系；了解聚合物基复合材料的制备方法、研究方法、结构形态、力学性能以及制备聚合物基复合材料的高分子材料和填料、纤维等基本知识和应用。

The location of university is the procession of the "preparation", this preparation is also manifested the forwarning trait of higher education, in this paper, we want to discuss theories of the location of universities, and that, discussing theories is always started from the basic concept, therefore, at first, we clarified the concept such as university, location and the location of university.

本文旨在探讨大学定位的相关理论，而探讨理论往往是从其最基本的概念开始的，所以文章首先对大学、定位、大学定位等几个基本的概念进行厘清。

In the analysis of the BOD5 of inlet water of Fuxian Lake,the source,ratio and pre-treatment of inoculums and the preparation method of inoculums diluting water were also studied.The experiment data showed that the proposed preparation methods were feasible.

在对抚仙湖入湖河流BOD5进行分析的过程中，对几种接种液的来源、配比、预处理及接种稀释水的配制方法进行了研究，并通过一系列的实验数据说明了这些配制方法的可行性。

This paper describes the requirements on pure water and the methods for its preparation, especially the preparation of water used in laboratory by reverse osmosis method.

本文介绍了对分析实验室用水的要求和水质纯化方法，重点介绍反渗透法制备实验室用水的有关问题。

In this paper,the SMO-type lithium ion sieve was the main research object,the manganates and lithium salts were taken as the main raw materials.Two LISs with high uptake capacity,better selectivity and stable structure were successfully prepared by hydrothermal method and coprecipitation method based on the discussion of correlation between Li+ uptake performance and the preparation conditions of LIS precursors.The effects of preparation conditions on Li+ uptake were also investigated.

本文以SMO型锂离子筛为研究对象，以锰盐和锂盐为主要原料，在采用固相法探讨离子筛前驱体制备条件与离子筛提锂性能关系的基础上，分别采用水热法、共沉淀法为主要合成方法，成功制备了具有高提锂容量、选择性好及结构稳定的两种锂离子筛材料，并研究了合成条件对材料制备及提锂性能的影响。

To hold this awareness of the national territory and the map management classes is designed to strengthen the relevant management personnel and employees of the national territory of consciousness, master map of the preparation, publication of laws and regulations knowledge, improve Internet map service units and map units in the preparation of a map of security responsibilities heart and checking capabilities, starting from the source, reduce "problem map" frequency, so that a marked map of the market order, continuous improvement.

举办这期国家版图意识及地图管理学习班的目的是为了强化相关管理干部和从业人员的国家版图意识，掌握地图编制、出版的法律法规知识，提高互联网地图服务单位和地图编制单位的地图安全责任心和把关能力，从源头入手，降低&问题地图&的出现频率，从而使地图市场秩序得到明显、持续的改善。

The preparation method has advantages of simple technology process, mild reaction condition and low preparation cost.

本发明工艺过程简单，反应条件温和，生产成本低。

The salzburg vitriol preparation, the sulfuric acid four ammonations coppers preparation and the correlation product nature experiment carries on the conformity, constructs the copper element the synthesis experiment system.

将五水硫酸铜的制备、硫酸四氨合铜的制备及相关产物的性质实验进行整合，构建铜元素的综合实验体系。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。