用前线分子轨道（FMO）理论可以说明上述反应的区域选择性与位置选择性。
The regioselectivity and site selectivity of above cycloadditions can be elucidated by FMO theory.
一定条件下该硝化剂具有较好的反应位置选择性，这一是由于反应介质低的介电常数，二是多孔载体也具有明显的作用。
In this system good regioselectivity can be achieved mainly because of the existence of a porous support and the low dielectric constant of the reaction media.
你一定看到过选择性使用颜色的例子：一个艺术家拍完了照片，将所有颜色去掉，只保留焦点位置的颜色。
Almost assuredly, you’ve seen the use of selective chromacity: an artist will take a photo and remove color from everything except the area of focus.
乙基化的选择性则与催化剂的表面酸强度、酸性中心位置和孔道结构等因素有关。
Ethylation selectivity, was affected by strength of surface acid sites, location of acid sites and pore structure.
返回抑制是指对先前注意的位置上进行反应所表现出的滞后现象，是选择性注意的一个重要现象。
Inhibition of Return (IOR) is the hysteresis phenomenon shown by the reaction of the previous note on the location and it is a significant phenomenon to selective attention.
研究了反应的催化剂，反应位置的选择性和加料方式等因素对反应的影响。所合成出来的化合物均经分离、提纯、分析测试。
The effects of catalysts, the feeding condition and the selectivity of the reacting position in the condensation reactions were studied, and the compounds had been separated, purified and analysed.
讨论了臭氧段的位置对漂白效率和选择性的影响，叙述并提出了Z 3技术的最佳操作条件。
The effect of Z-stage location on bleaching efficiency and selectivity is discussed. A description of, and the best operating condition for, the so-called Z3 technology are also presented.
结果显示对1,3-取代位置的优异选择性，并且烷基链可以是饱和的或不饱和的，并且可以含有一种或多种杂原子。
The result shows excellent selectivity of to the 1, 3 - substitution positions, and the alkyl chain may be saturated or unsaturated and may contain one or more heteroatoms.
溴原子所在的位置对反应的对映选择性有一定影响。
The position of bromo atoms has definite influence on the sulfoxidation of enantioselectivity.
任何不具有意义资料的选择性栏位都会包含一个零(0)或空格做为预留位置。
Any optional field for which there is no meaningful data contains a zero (0) or a space as a placeholder.
使用指定的文字以及选择性的焦点矩形，在指定的状态和位置中绘制核取方块控制项。
Draws a check box control in the specified state and location, with the specified text and image, and with an optional focus rectangle.
同时发现有些病例虽然肝动脉及其分支无变异，但肝动脉走行位置变异，对选择性肝动脉插管有较大影响。
Meanwhile, the localization variation of hepatic artery, although without constructional variation, had noticeable influence on hepatic artery catheterization.
同时发现有些病例虽然肝动脉及其分支无变异，但肝动脉走行位置变异，对选择性肝动脉插管有较大影响。
Meanwhile, the localization variation of hepatic artery, although without constructional variation, had noticeable influence on hepatic artery catheterization.
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