查询词典 benzene

The homologs of benzene are those containing an alkyl group or alkyl groups in place of one or more hydrogen atoms.

苯的同系物是指是那些苯环上有一个或多个氢原子被一个或多个烷基替代而构成的物质。

The homologs of benzene are those containing an alkyl group or alkyl groups in place of one or more hydrogen atoms.

苯的同系物是指分子中只含有一个苯环，由一个烷基团或多个烷基团取代了苯环上一个或多个氢原子。

The homologs of benzene are those containing an alkyl group or alkyl groups in place of one or more hydrogen atoms.

苯的同系物就是含有一个苯环，并且与苯相差若干个CH2原子团的一系列物质。

The homologs of benzene are those containing an alkyl group or alkyl groups in place of one or more hydrogen atoms.

苯的同系物是指分子里含有一个苯环，组成符合CnH2n-6（n≥6）的环烃。

The homologs of benzene are those containing an alkyl group or alkyl groups in place of one or more hydrogen atoms.

苯环上一个或多个氢原子被烷基基团所取代的化合物称为芳香族同系物。

The homologs of benzene are those containing an alkyl group or alkyl groups in place of one or more hydrogen atoms.

苯的同系物是指分子里含有一个苯环，组成符合CnH2n-6（n≥6）的环烃。1很正确，2有点过了！金币+ 5 个万客币+ 5 个

Objective:To investigate the air pollution of decorating material markets to study the health effect of working people exposure to low concentration of formaldehyde and benzene homologues in that place.

目的：了解建材市场的主要污染物及其污染水平；研究低浓度甲醛、苯系物暴露对从业人员的健康影响。

Treatment of children with ADHD drugs more, such as methylphenidate, d-amphetamine, benzene iso-mephenytoin, caffeine, such as imipramine.

治疗小儿多动症的药物较多，如哌醋甲酯，右旋苯丙胺，苯异妥英，咖啡因，丙咪嗪等。

A new method for the separation and purification of chiral mandelic acid by heated benzene extraction and refrigeration crystal was established. The ionization constant of mandelic acid was mensurated by pH potentiometer titration.

采用pH值电位滴定法测定了扁桃酸的离解常数，采用高效液相色谱法考察了扁桃酸在不同溶剂中的溶解度曲线和在苯-水体系中于不同pH值条件时的分配率，建立了热苯萃取和冷却结晶的扁桃酸纯化工艺。

The solubility curve of mandelic acid in different solvent and the distribute ratio of mandelic acid in benzene-water system in different pH condition were determine by HPLC. The results showed that the ionization constant pK_a of mandelic acid was 5.28, the solubility of mandeli...

研究结果显示，扁桃酸的离解常数pKa值为5.28；扁桃酸在水和苯中的溶解度曲线可分别表示为：S=38.756e0.0354t和S=0.2746e0.0649t；扁桃酸在水和苯中的溶解度差值曲线可分别表示为：ΔS/S1=0.1196t-2.712和ΔS/S1=0.3688e0.0723t；苯是最适合用于冷却结晶的溶剂；热苯萃取扁桃酸的苯水比例可选为1∶1；降低pH值有利于扁桃酸在苯中的分配。

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。