选择反应

Chapter Ⅶ Harmonious Development Mechanism and Management Pattern Formation of Urban System in Central Shaanxi Plain Firstly, three different view layers of macro, medium, and micro are adopted to study the relevant mechanism for developing urban system in Central Shaanxi; The macro layer mainly probed into the affect from government affair to urban development, reached the conclusion that whether government will rationalize and benefit the harmonious development will be largely owed to the government affair regulation and adaptive general planning system to fix on the urban construction aims and stresses on the foundation of speeding up mechanism and principle innovation; The medium emphasized analyzing the Industry assembling mechanism for harmonious development acceleration and regional distribution and cross-regional adjustment among economic zones from the two aspects of Industry structuring and regional economic spatial location; The micro analyzed the behavioral characteristics of the micro subject and its motivation effects in the urban system development from aspects of enterprises, non-governmental organizations and the public, and set up the compatible mechanism of its active stimulus and restriction.

本章首先从宏观、中观和微观三个层面入手研究了推进关中城镇体系协调发展的相关机制：（1）宏观层面重点研究了政府行为对关中城镇体系发展的影响，认为在不同制度环境下地方政府行为选择也是对其它主体行为选择的理性反应，但地方政府行为能否趋于理性化并有利于关中城镇体系的协调发展，关键还是在于尽快完成关中体制创新和制度创新的基础上，规范政府行为，建立有助于地区利益协调的宏观调控体系，并以此为基点确定了关中城镇体系的宏观调控目标与重点；（2）中观层面重点从产业组织和区域经济空间组织两个方面分析了推进关中城镇体系协调发展的产业聚集机制和各城市经济区的区内组织及区际协调机制；（3）微观层面从企业、非政府组织和公众三个方面入手。分析了微观主体的行为特征及其参与关中城镇体系协调发展的积极作用，并建立了促进微观主体主动参与的激励—约束相容机制。

The more active catalyst and the more suitable carrier should be selected further not only to heighten the yield of MPC and DPC,but to avoid the production of anisole at above 250℃.

由此可以知道，要想使得MPC、DPC产率增加需选择更适合的催化剂，而对于高温下气固相反应应该选择更适合的能有效抑制苯甲醚副反应发生的催化剂载体。

Different escharotic decide the different speed of reaction, thus to cause the great effect on stone carving speed, carving effect, for example, marble whose mainly component is carbonate, so it is better to choose escharotic made from HCI, while for granite , whose mainly component is silicate, it is better to choose escharotic made from HF

腐蚀剂类型的不同又决定了反应速度的差异，进而对雕刻速度、雕刻效果都会生产比较大的影响，例如，以碳酸盐为主要成分的大理石类石材，选择由HCl配制的腐蚀剂比较适宜；而以硅酸盐为主要成分的花岗石类石材，选择由HF配制的腐蚀剂比较适宜。

We have studied the transition metal complexes catalyzed sequential cross coupling reactions of these new difunctional group reagents with electrophiles and nucleophiles, respectively; developed some convenient and practical new methods for the stereoselective synthesis of disubstituted alkenes, trisubstituted alkenes, conjugated dienes containing heteroatom, conjugated enyne containing heteroatom etc., enriching methodologies for organic synthesis.

继而研究了这些新型双官能试剂在过渡金属配合物催化下分别与亲电试剂、亲核试剂的顺序交叉偶联反应，为双取代烯烃、三取代烯烃、杂原子取代的共轭二烯烃、杂原子取代的共轭烯炔烃等的立体选择合成提供了方便实用的新方法，丰富了烯烃立体选择合成的方法学。

The selective oxidation of isobutane to methacrylic acid is one of the most complex processes in partial oxidation of alkanes.

异丁烷选择氧化制甲基丙烯酸是烷烃选择氧化工艺中反应历程较复杂的过程之一。

The selective oxidation of isobutane to methacrylic acid is one of the most complex processes in partial ox...

异丁烷选择氧化制甲基丙烯酸是烷烃选择氧化工艺中反应历程较复杂的过程之一。

The progress of catalysts, which include composite-oxides catalysts and heteropoly compounds catalysts, for selective oxidation of isobutylene to methacrolein were summarized, the mechanism of this reaction on Mo-Bi catalysts was discussed.

本文综述了异丁烯选择氧化生成甲基丙烯醛催化剂，其中包括复合氧化物催化剂和杂多化合物催化剂等的研究现状，讨论了在Mo-Bi催化剂上异丁烯选择氧化生成甲基丙烯醛的反应机理。

The CLA was prepared by the alkali isomeration using KOH as catalyst and sunflower oil as raw material.

探讨了溶剂的选择，反应时间、反应温度以及催化剂用量对产物中共轭亚油酸含量的影响。

Thermodynamic analysis is carried out for the compound reaction system of diethyl ether and methanol from synthesis gas. The equilibrium composition and the selectivities in equilibrium are calculated for different initial compositions, temperature and pressure.

确定了合成气直接合成二甲醚与甲醇的复合反应体系独立方程数，并进行了热力学计算与分析，计算了不同初始组成、温度、压力下复合反应体系的平衡组成及平衡条件下二甲醚与甲醇的选择率。

Under above mentioned conditions, the initial reaction rate and enantiomeric ratio of the reaction are 5.88 mmolL^(-1)h^(-1) and 83. After reaction time of 6h, the yield and the product e.e.

在上述条件下，反应初速度和对映体选择比分别为5.88mmolL^(-1)h^(-1)和83，反应6h，产率为47.6%，产物e.e。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。