查询词典 benzene

This showed that the electron density of a quinoid ring increased. The peaks of the quaternary carbon atoms of the benzene rings, which were adjacent to the quinoid ring, also shifted to higher field. But the peaks of other C atoms shifted to lower field.

NMR结果表明苯胺低聚体掺杂后主链上的电荷重新分布，环上的H原子上的电子被C原子吸引，电荷密度降低，在〓 NMR中谱峰向低场移动。C原子的谱峰也相应发生变化，醌环上电荷密度增加，全部C原子的峰向高场移动，与醌环相邻苯环受其影响季碳峰移向高场，非季碳峰移向低场。

Main types of indoor air pollution for formaldehyde, benzene caused by chemical pollution, biological pollution caused by bacteria and viruses radioelement and dust caused by the physical pollution.

室内空气污染类型主要为甲醛、苯引起的化学污染、由细菌病毒引起的生物污染及由放射性元素和尘埃引起的物理污染。

Proposed first by a hospital or occupational disease prevention and to determine whether benzene poisoning, re-treatment, not their diagnosis, to avoid misdiagnosis.

拟议的医院或职业病防治，以确定是否苯中毒，重新处理，而不是他们的诊断，以避免误诊第一。

The protein had the specificity on substrate recognition, which could decompose 3,4-dihydroxybenzoic acid to catechol but not 2,4-dihydroxy- benzoic acid to resorcin. The ligand at C-3 site of benzene ring had no effect on enzyme activity.

蛋白质还具有底物识别的特异性，能够催化3，4-二羟基苯甲酸转化为邻苯二酚，而不能催化2，4-二羟基苯甲酸转化为间苯二酚，这表明苯环上3'位的配基对酶活无影响。

From the structure, tetraazaparacyclophane is a ring compound with benzene rings connected by nitrogen-containing carbon bridges. It has a well-defined hydrophobic cavity.

四氮杂环蕃从结构来看是由氮杂碳桥将芳香环连起来的环状化合物，分子内具有空腔，该空腔上的芳环呈侧立状，具有一定的深度，并具有疏水性。

In pH value 6.40 Clark-Lubs buffer solution, the fluorescence intensity of safranine T and sodium dodecyl benzene sulfonatewas determined. After adding organophosphorus pesticides, the fluorescence intensity was determined. Based on this, a new fast and simple method for determination of the organophosphorus pesticides total-residues was developed.

方法］在pH值6.40的Clark-Lubs缓冲溶液中，加入碱性藏花红与一定浓度的十二烷基苯磺酸钠，测定荧光强度，再加入有机磷农药，检测荧光强度变化，据此建立测定有机磷农药残留总量的新方法。

It is based on the facts that in the presence of sulfuric acid and sodium dodecyl benzene sulfonate, vanadium activated by vitamin C can catalyze potassium bromate to oxidize safranine O, the oxidation products of safranine O can emit intense and stable fluorescence on nitrocellulose membrane.

基于在硫酸介质和十二烷基苯磺酸钠存在下，抗坏血酸活化钒催化溴酸钾氧化番红花红O发射强而稳定的荧光的特性，建立了ⅤC活化溴酸钾氧化番红花红O催化荧光法测定痕量钒的新方法。

The paper analgses nitrobenzene and benzene in polluted water of TongJiang section,TongJiang Dong Gang section and Bacha section of songHuaJiang and HeiLongJiang river.

本文通过对双苯污染带流经松花江和黑龙江的同江断面、同江东港断面及八岔断面监测分析，对同江段水质受硝基苯污染的状况作出了科学的分析评价。

When the catalyst was triethylamine, the water produced in condensation of isopropanolamine or ethanolamine and butanone was removed with benzene by water segregator, then the dichloroacetyl chloride was dropped.

利用异丙醇胺、乙醇胺、丁酮和二氯乙酰氯为原料，分别合成了两种除草剂安全剂Ⅰ∶3-二氯乙酰基-2，5-二甲基-2-乙基-1，3-噁唑烷和Ⅱ∶3-二氯乙酰基-2-甲基-2-乙基-1，3-噁唑烷。

Similarly, the rule and the suitable process parameters of the photochlorination of m-chloromethyl benzene in the side chain were obtained.

用同样的研究方法得到了间氯甲苯侧链光氯化反应规律，得出了适宜的工艺条件。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。