取代物

The effect of controlling microstickies in recycled newspaper pulp and the effect on the resultant paper property of some fixatives,including inorganic polyaluminum chloride,organic polyamine,polydiallydimethyl ammonium chloride,and high cationic starch,were investigated in this paper.

分别以聚合氯化铝、聚胺、聚二甲基二烯丙基氯化铵和高取代度阳离子淀粉作为固定剂，研究了它们对废纸浆中微胶黏物的控制效果及对纸页性能的影响。

According to the results of the examination, the stronger the electron-withdrawing protective group of imines, the better the cis-selectivity of the reaction, 68% yield, trans:cis is 99:1 diastereoselectivity could be leaded by Ts-imines (4-methyl-N-methylene-benzenesulfonaides) with a substituent [2,4-(CH3O)2C6H3], Substrate scope investigation revealed that a wide variety of ketenes and imines could react smoothly to afford corresponding,β-lactams.

实验结果表明，亚胺的保护基团吸电子能力越强，越有利于顺式产物的生成。对甲苯磺酰基保护的取代基为2，4-二甲氧苯基的亚胺参与的该反应可得到68%的产率，反式：顺式=99：1的非对映选择性。底物拓展过程中发现Staudinger反应适用于多种不同的亚胺与烯酮。

As a senior American team arrived in Beijing on Sunday for climate talks, the standoff was taking on the trappings of cold-war arms control negotiations, with gigatons of greenhouse gas emissions replacing megatons of nuclear might as a looming risk for people across the globe.

美国资深团队于星期日抵达北京就气候问题参与会谈，在控制冷战武器饰物谈判上呈现和局，紧接着以数十亿顿的温室气体排放物取代数兆吨的核能的提出就像海市蜃楼一样在全球范围内给人类带来危险。

In the second part, we studied the reactions of tonghaosu analogs with mercaptans alcohols and organic metallic reagent under acid condition. Moreover, we synthesized and determined a natural compound by using this kind of reaction.

第二部分研究了茼蒿素类似物在酸性条件下与硫醇、醇、有机金属试剂发生亲核取代反应，同时通过这类反应合成了一天然产物。

The influences of the amount of the catalysts,the temperature and the electronic effect of the substrates were discussed.

研究了底物取代基的电子效应，立体结构等因素对这一反应的影响。

We should not be able to count on the facts that lie before us. Simulation is an important concept of Jean Baudrillard's (1929-) theory. He thinks that the post-modern culture is full of simulation activities. The realistic world has disappeared or been replaced by simulation and simulacres.

拟像 为布希亚(Jean Baudrillard，1929~)论述的重要概念，他认为在后现代的文化里充斥著许多拟像的活动，现实世界已经消失或被取代，已是拟像与拟仿物的世界。

Our country major adopt to fill bury and burn method, handling few discard glass fiber some kinds of from time to tome following methods:( 1): Replace wood chip as the filler of sculpture arts and crafts.

英语神仙来啊！帮我翻译我国主要是采取填埋和焚烧方法，处理少量废弃玻璃纤维时有以下几种方法：(1)：取代木屑作为雕塑工艺品的填充物。

Axial group, substitution on the aromatic rings of SalenAlX, and co-catalyst all affect catalytic properties of these aluminum complexes.

席夫碱铝配合物轴向基团、苯环上的取代基团以及助催化剂等对其催化性能有很大影响。

The electrochemical behavior on tetramethylquinone in n-butylpyridini-um chloride-aluminum chloride, a room temperature molten salt , is dependent on theacidity of this melt.

四甲基苯醌在氯化正丁基吡啶－AlCl＿3室温熔盐中的电化学行为，和室温熔盐的酸碱度有关，在碱性熔盐中，四甲基苯醌以不络合的形式存在，电极上的还原过程是一个ECE过程；在酸性熔盐中，形成络合物TQ（AlCl＿3）＿m，络合数m为1，2，3，随熔盐酸度变化，此外，醌类物质芳香环上的取代基，也影响其电化学性质。

Saddle the introduction of the stirrup in Europe is a major event, which is to replace the cavalry infantry war in the Middle Ages to become the main force, Once the stirrups in the 8th century to become the object of universal Franks, the horses can be used not only focus on rapid, and can also be used to the combat.

鞍镫的引进，在欧洲来讲是一件大事，正是它使骑兵取代步兵成为中世纪战争的主力，一旦马镫成为8世纪的法兰克人通用之物，马匹不仅能用于迅速集中力量，并且也能用来作战了。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。