成酸性

The experimental results showed that H-MCM-22 possessed a high activity on alkylation of toluene with methanol, but low paraxylene and xylene selectivity.

采用NH3-TPD、IR等表征了改性前后催化剂的酸性，考察了改性MCM-22分子筛上甲苯与甲醇烷基化合成对二甲苯的反应性能。

Polyvinyl acetate resin was prepared by suspension polymerization, and modified to carboxymethylated polyvinyl alcohol resin after several steps of reaction.

以悬浮聚合方法合成大孔聚醋酸乙烯酯树脂，通过一系列反应修饰成弱酸性阳离子交换树脂，表征了树脂的性能。

Dongan gold deposit is a epithermal gold deposit occurring in the strong silicification zone of Late Indosinian alkali feldspar granite and Late Yanshanian fine-grained alkali feldspar granite in the intermediate-acidic volcanic-intrusive rock.

东安金矿床是浅成低温热液型金矿床，赋存于中酸性火山-侵入岩、印支晚期碱长花岗岩和燕山晚期细粒碱长花岗岩脉强硅化蚀变带中，受库尔滨断裂的次级断裂控制。

This product performance: This product is skim the surface acidic agent, using a variety of organic acids, inorganic acid, surface active ingredients, and add the mixture from the relevant agent.

本品性能：本产品属于酸性表面脱脂剂，采用多种有机酸、无机酸、表面活性成分，并添加相关助剂复配而成。

The influence of environmental variables on distribution of PAHs(1) The concentrations of PAHs were higher in warm temperate zone and subtropical zonethan in low temperature zone;(2) The concentration in plain, hilly land and Ya\'an mountainousregion were higher than in other places;(3) The concentration in paddy fields, dry land andforests were higher than in artificial land and grass;(4) There was positive correlation betweenthe concentration of PAHs and TOC. The correlation was more obvious for 4-rings PAHs thanfor 5-, 6-rings PAHs;(5) The concentration of PAHs in acid soils was higher than in alkali andneutral soils;(6) The concentrations in conifer and spinney forest were higher than inbroad-leaved forest.Part two: The temporal and spatial distribution characteristics of POPs at Basin-MountainTransect.

环境因素对多环芳烃分布的影响(1)温带和亚热带地区土壤多环芳烃含量高于低温地区土壤中多环芳烃含量；(2)在平原、匠陵和雅安市附近的山区多环芳烃含量高于其他地区含量：(3)水田、旱地和林地多环芳烃含量高于建筑用地和草地中含量；(4)多环芳烃含量和土壤总有机碳含量成正比，四环多环芳烃与总有机碳的相关性高于其他多环芳烃的相关性；(5)酸性土壤中多环芳烃含量高于碱性和中性土壤中含量；(6)针叶林和灌木林多环芳烃含量高于阔叶林中的含量。

In syndiagenetic stage, Zhiluo formation in Dongsheng area is open system. Diagenetic environment is oxidation and subacidity that CO_2 is given out in the transition of organic matters and coal.

同生成岩阶段，东胜地区直罗组为开放体系，地层中的有机质和煤在转化过程中释放出CO_2，成岩环境为氧化和弱酸性环境。

Sulphite pulp: Acid pulp made from wood chips cooked under pressure in a solution of bisulphite of lime.

亚硫酸盐浆：把木片在亚硫酸钙溶液内加压蒸煮而成的酸性浆。

Sulphite pulp: Acid pulp made from wood chip s cooked under pressure in a solution of bisulphite of lime.

亚硫酸盐浆：把木片在亚硫酸钙溶液内加压蒸煮而成的酸性浆。

Lighter colors were achieved by the ancient Roman women who used acidic plant extracts and sun to bleach their colors.

为染成浅色，古罗马女性提取酸性植物侵出物，晒在阳光下漂泊发色。

Master the Keto-Enol tautomerism; reactions of enols:α-H substitution reactions;α-halogenation of aldehydes and ketones;α-bromination of carboxylic acids; acidity ofα-H atoms: enolate ion formation; reactivity of enolate ions; alkylation of enolate ions; mechanism of carbonyl condensation reactions;condensations of aldehydes and ketones: the Aldol reaction; dehydration of Aldol products; the Claisen condensation reaction; the Michael addition.

熟练掌握酮式－烯醇式互变异构；烯醇的反应：α-H的活性；醛酮的α卤代反应；羧酸的α-溴代反应；α-H的酸性：烯醇负离子的形成；烯醇负离子的反应；烯醇负离子的烃基化；羰基化合物的缩合反应机理；醛酮的缩合反应－Aldol缩合；Aldol缩合产物的脱水反应； Cleisen 酯缩合反应；麦克尔加成反应。

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。