The ee values of the final products were very close to those of α-hydroxy ketones, which indicated that no racemization occurred in the substitution.

In the substitution reaction of nucleophilic, whatever we use S_N1 or S_N2 reaction course, the rate of reaction is the most rapid.

在亲核取代反应中；无论按S N1历程还是S N2历程，烯丙式卤代烃的反应速度都是最快的。

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Studies on the Reaction of Aromatic Nitro Compounds with Sodium Phenylthiolate& Radical IPSO Substitution Mechanism

芳香族硝基化合物与苯硫酚钠盐的亲核取代反应&自由基IPSO取代机理

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A radical IPSO substitution mechanism is proposed.

提出自由基IPSO亲核取代反应机理。

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A New Mechanism of Nucleophilic Substitution Reactions for Alkyl Halides& S_ ( RN) 1

卤代烷亲核取代反应的一种新机理&S（RN）1

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Recent progress on Vicarious nucleophilic substitution reaction

Vicarious亲核取代反应研究进展

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In contrast, electro-withdrawing groups CHO and COCH_ 3 on the attacking site will favor the intramolecular nucleophilic substitution of nitrogen and form 5-membered heterocyclic compounds.

而当R为吸电子基团-CHO、-COCH3时，主要发生分子内氮原子上的亲核取代反应，产物为含氮的五员杂环化合物。

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Intensify the political training of officers and men and especially the education of ex-prisoners.

加紧官兵的政治训练,特别是对俘虏成分的教育要加紧.

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Also many officers and men have fallen ill from malnutrition, exposure to cold or other causes.

由于营养不足 、 受冻和其他原因,官兵病的很多.

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Officers and men at the front are shedding their blood and sacrificing their lives.

前线将士,牺牲流血.

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On a festive celebration, Lee Department of the officers and men were competing on stage acting.

每逢节日喜庆之时, 李部官兵均竞相登台演戏.

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Will he go where our people live scattered among the Greeks, and teach the Greeks?

难道他要往散住希利尼中的犹太人那里去教训希利尼人 么 .

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The first quarter of the registered urban unemployment rate 4.3 percent, roughly flat with last year.

一季度城镇登记失业率百分之四点三, 与去年大体持平.

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UnIt'sales are over the mean for the first quarter or above the mean.

我们队和对手在开始的四分之一场里打了个平手.

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The first quarter of this year, its performance fell, mainly in the field of aviation products.

而今年一季度其业绩下滑, 主要体现在航空产品领域.

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Prior to the company report a profit decline in the first quarter and a dividend cut.

此前该公司报告上一季度盈利下降,并削减了股息.

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However, not all coal stocks in the first quarter of this year could have been achieved.

不过, 并非所有煤炭股都能在今年一季度有此成绩.

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In these objectives actions have to be conducted to communicate with customers and prospects.

针对与以上目标,需要通过以下方式与消费者积极沟通.

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Establishes an empirical formula relating temperature to saturated humidity ratio under standard atmospheric pressure by means of polynomial regression. Analyzes the calculating error in common engineering temperature range, and the error is less than 2.1 percent.

利用多项式回归拟合了标准大气压下温度与饱和含湿量之间的经验公式，并进行误差分析，认为在工程常用温度范围内，计算误差小于2.1%。

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Dependence of flashover voltage on gas pressure has been measured in vacuum and in atmospheric air using 10/ 30-nanosecond pulse power. The scope of gas pressure is between 8 × 10-4 Pa and standard atmospheric pressure.

对纳秒脉冲（10/30ns）下真空绝缘闪络电压随气压的变化趋势进行了实验研究，探讨的气压范围介于8×10-4Pa至标准大气压之间。

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The products have a dielectric strength greater than 30 kV/ mm and surface flashover strength of ( 35 ± 5) kV/ cm in N2/ SF6 atmosphere at standard presure.

制品的电击穿强度大于30kV/mm，在标准大气压下测得的表面闪络强度（充N2/SF6气）为（35±5）kV/cm。

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