优势种

The auxiliary can be recovered in high yield (81%) only by filtering and recrystallization. Besides, some other aldehydes have been chosen to test the enantioselectivity of N,N\'-dibenzyl tartamide, in comparison with two other allylaborates reagents developed previously by Roush and Brown, respectively. The results show that %e.e. of homoallylic alcohol is superior to that of the former, and approaches the Brown reagent.

产物经S_N2反应得瑞格列萘中间体-甲基烯丙基-2-氯苯基-叠氮甲烷(17)；同时，将筛选出的新型手性配体N-苄基酒石酸二酰胺用于其他几种醛(正丁醛，异戊醛和环己醛)的不对称烯丙基化反应，并与广泛应用的Roush配体(22)和Brown配体(27)相比较，发现其立体选择性优于Roush配体，并接近Brown配体，但明显具有可回收利用的优势。

The empirical analysis result indicated that the correspondence analysis could reveal the internal relations between sample sources and variable,and was an analytical method with superiority.

实证分析结果表明，对应分析能够揭示出样品来源与变量之间的内在联系，是一种有优势的分析方法。

Because the sapogenin wastewater is highconsistency organic wastewater,we developed the twophase anaerobic digestion with three stages that acidification phase, inner electrolysis phase and methane phase.

开发了三阶段两相厌氧工艺即酸化、内电解、厌氧产甲烷的工艺处理皂素废水。从理论上分析了该工艺处理黄姜皂素废水的机理和优势。在实验条件相同时，改变内电解在工艺中的位置进行间歇式厌氧处理，测得2种厌氧工艺的处理效果。实验结果表明内电解在两相厌氧中间CODC r的去除率要优于内电解在酸化前

On the basis of analyzing synthetically the above techniques, a superior technology of flue gas desulfurization by scrap iron is presented.

在综合考虑以上工艺路线基础上，本文提出了一种更有优势的铁屑法烟气脱硫新工艺，主要研究内容有： 1。

It'sa self fulfilling prophecy when we send out wrong messages to the younger generation to stay away from these fields. America will surely loose competitive edge with this kind of attitude.

一种自我实现的预言，当我们发送出错误的讯息年轻一代远离这些领域，美国似乎一定会松脱的竞争优势，有了这种态度。

This article begins from the methodological features of structural realism and then analyses the ontological status of sapcetime point in the debate of spacetime realism and advantages and disadvantanges of structural realism.And finally,we discuss the main forms of structual spacetime realism and their methodological features,point out a holism trend on the basis of semantical concep...

文章从阐述结构实在论的方法论特征开始，继而分析了时空本体论争论中时空点的地位、结构实在论方法的可能优势及不足，最后探讨目前存在的结构时空实在论的主要形式及其方法论特征，指出一种语义概念下的整体主义方法论趋向。

As a new signal processing method, Wavelet analysis decomposed different kinds of frequency element to non-overlapped frequency bands and this method put forwards an effective way to signal filter, signal-noise separating and character picking-up, especially it has well de-noising capability.

小波分析作为一种全新的信号处理方法，它将信号中各种不同的频率成分分解到互不重叠的频带上，为信号滤波、信噪分离和特征提取提供了有效途径，特别在信号去噪方面显示出独特的优势。

Results: There were 237 samples containing shigella in the 2626 samples, and the rate was 9.03%.

本地区出现了一种新的志贺氏菌血清型F4c占28.69％，是引起本地区菌痢的优势菌型。

Like how it is in Shogi or Chess,"Able to take strong opponent at 1 on 1" is merely one of many choices in tactical point of

这就像是将棋和国际象棋，能够在1对1中处于绝对优势，在战术层面上来看，仅仅是很多选择中的一种罢了

This paper firstly presents the expressions of energy consumption in two types of blank holding, the conventional hydraulic cushion and cushion-compensating cylinder, in single-action deep-drawing hydraulic press, and shows through comparison that the consumption in later is far less than in the former.

本文首先运用能量法推导了单动拉深液压机的两种压边方式即传统液压垫压边方式和液压垫-补偿缸压边方式的能量损失表达式，通过比较，得出后者在压边节能方面存在优势。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。