Five Schiff bases were prepared from piperonal and diamines by condensation reaction.

合成新的双-胡椒醛缩二胺类席夫碱化合物。

A policeman snapped handcuffs around his wrists.

警察喀嚓一声把手铐铐到了他的双腕上。

Figure 14.5 and 14.6 show this division for a homonuclear and a heteronuclear diatomic molecule.

图14．5和14．6示出同核和异核双原子分子的这种分区。

Metformin hydrochloride is an orally administered biguanide widely used in clinical medicine.

盐酸二甲双胍是目前广泛用临床医学的双胍类降糖药。

Proposes pictureencryption algorithm based on the double unidimensional chaos system.

摘要 提出了一个基双一维混沌系统的图像加密算法。

In this paper, the two-photon autoionization involving second-order ionization process under strong laser field is investigated.

本文研究了包括二阶离化过程的强激光场下的双光子自电离。

A new kind of bismaleimide resin system which can be easily dissoled in aceton is prepared.

研制了具有良好溶液性质的双马来酰亚胺树脂体系的新方法。

Bisync acknowledgment for odd-numbered message.

用的双同确认。

Bisync acknowledgment for even-numbered message.

有关偶的双同知识。

Incorporation of a dideoxy analog prevents further elongation and so produces a chain termination extension product.

双脱氧类似物的插入将阻止进一延伸，而产生链终止延伸产物。

Preparation of ethylene bis stearamide using stearyl chloride and ethylenediamine (EDA) as raw materials has been studied.

研究了以乙二胺和硬脂酰氯为原料制备乙撑双硬脂酰胺的反应,讨论了原料配比、反应时间、反应温度的影响。

The first liquid crystal material has birefraction index approximately equal to one half of that of the second liquid crystal material.

其中，第一液晶材料层的双折射率约略等第二液晶材料层的双折射率的一半。

If the characteristic is governed by simple Mendelian genes, the typical monohybrid and dihybrid ratios become apparent in the F2 generation.

如果其特征取决单一孟德尔基因，那么典型的单基因杂种和和双基因杂种的遗传比率将在子二代呈现。

The applications of SKALAR brand interval flow analyser in the analysis of fermentation liquid and content of product biacetyl were introduced.

介绍利用SKALAR间隔流动分析仪对发酵液、成品双乙酰含量的分析,并对SKALAR与GB法的分析结果进行比较、分析。

In this paper,the methods of producing sodium diacetate have been described.It is widely used as high effective preservative in grains,dodders,foods and so on.

论述了双醋酸钠的制备方法及其在防腐、保鲜、洗涤等领域的应用。

Ambipolar transistors are attractive for realizing complementary-like organic integrated circuits, which operate with low power dissipation, wide noise margins and great operational stability.

目前，国际上有机双极性晶体管的研究由受到种种限制性能并不理想，很少能获得对称性良好的高性能器件。

The most stable biradical rule,which was put forward at the beginning of the discovery of the P-B reaction,was used to explain its regioselectivity.

在P-B反应发现之初,人们一直用“最稳定的双自由基规则”解释其区域选择性,这一规则对有些体系却不适用,近年来有人开始运用“自旋化学”理论来解释区域选择性。

The studies on the perferable conditions for synthesizing diglycol dioleate, by the esterification of diglycol monoleate with oleic acid via acid catalysis, were reported.

研究了以二甘醇单油酸酯和油酸作原料进行酸催化酯化反应合成二甘醇双油酸酯的适宜反应条件。

The innovative DSG dual-clutch gearbox from Volkswagen offers previously unattained shifting comfort that lifts what were once well-defined boundaries between automatic and manual transmissions.

来自大众的创新的DSG双离合器变速箱提供以前达不到的换挡舒适性，消除了自动和手动变速二者间曾经轮廓分明的界线。

A new point is put forward that transverse bimoment has different influence on the two kinds of cross section thin-walled beams, and on their St-Venant principle conditions. 2.

同时对外载等效中经常出现的横向双力矩这一广义力进行研究，指出它在开口和闭口薄壁梁约束扭转问题中和圣维南原理适用条件中分别占有不同的地位。