查询词典 benzene

The effects of temperature, benzene to ethylene molar ratio and the weight hourly space velocity of ethylene on the catalyst performance were studied, respectively.

通过考察反应温度、苯烯摩尔比和乙烯质量空速对催化剂性能的影响，获得了如下适宜工艺条件：反应温度190～220℃，苯烯摩尔比6～8，乙烯质量空速≤2h-1。

Synthetic nitro-musks are used in the most wide area recently and industrial crystallization is the most important process to separate solid mixtures such as perfumes. In order to develop new crystallization process to separate synthetic nitro- musks, the phase equilibrium of musk ketone, musk xylene and 1,3-dimethyl-2, 4- dinitro-5-tert- butyl benzene were studied.

合成硝基麝香是用量最大的合成麝香而工业结晶是分离香料等固体产品的重要方法，为了开发麝香体系结晶分离新工艺，本文首先研究了酮麝香、二甲苯麝香和1，3-二甲基-2，4-二硝基-5-叔丁基苯的相平衡关系。

As shown in the experimental results: as the conductor of petroleum biological degradation, the quantity of microorganism is the important factor of petroleum degradation efficiency, the huge natural capacity of microorganism in soil is its foundation of bioremediation; petroleum density in certain scope do not affect for the degradation efficiency of petroleum, and in the density of 5%, its initial degradation efficiency is higher, however after training 40 days, this kind of advantage change weak gradually, the reason may be the petroleum of high density probably having certain poison role for microorganism; the best ecological condition of petroleum contaminated soil bioremediation is that nutrition material C: N = 60, electron receives body HiOi joining quantity amount to 12 mg/g, water content is 50%, surface activator is anion surface activator of 12 Wan base benzene sulphur sour sodium; the relation of primary and secondary of factor is water content, surface activator, nutrition material and electron receiver.

试验研究结果表明：作为石油生物降解的执行者，微生物的数量是影响石油降解效率的重要因素，土壤中微生物的巨大的自然容量是其生物修复的基础；石油浓度在一定范围内对石油的降解效率并没有影响，并且在5％浓度时，其起始降解效率较高，但是到了培养40天以后，这种优势渐渐变弱，可能还是高浓度的石油对微生物有一定的毒害作用；石油污染土壤生物修复的最佳生态条件为：营养物质C：N为60，电子受体H_2O_2的累计加入量为12mg/g，含水量为50％，表面活性剂为阴离子表面活性剂十二烷基苯磺酸钠；因素的主次关系为：含水量、表面活性剂、营养物质和电子受体。

Another important group of petrochemical raw materials are the aromatic compounds, principally benzene, toluene and xylenes, which are mainly produced by catalytic reforming.

另一组重要的石油化学品原料是芳香烃化合物，主要是苯、甲苯和二甲苯，主要由催化重整制得。

Because benzene and xylenes are being recovered as higher valued products, most of the heavy FCC gasoline must be reformed to recover gasoline pool octane.

由于苯和二甲苯恢复作为更高的被重视的产品，大多数重的FCC 汽油必须被改革恢复汽油水池八炭烷。

In this study, indoor and outdoor concentration levels of twenty-one carbonyl compounds and five BTEX (benzene, toluene, ethylbenzene and xylenes) were measured in four hospitals of Guangzhou.

大多数羰基化合物和BTEX的I/O比都大于1，说明这些物质有一定的室内来源。

The average of sum concentrations of five BTEX varied from 10.61 to 253.35μg/m^3.Toluene was the most abundant BTEX. All concentrations of benzene, toluene and xylenes met the Indoor air quality standard of China, and were lower than those observed in the hospitals of other countries.

结果表明，4家医院的5种BTEX的总浓度平均值为10.61~253.35μg/m 3.5种BTEX中，以甲苯的浓度最高，但均低于国家室内空气质量标准的阈值，也低于国外医院室内空气BTEX的浓度。

Objective To establish a gas chromatographic method with carbon disulfide desorption for benzene ,toluene and xylenes in time-weighted averageconcentration in the workplace air.

目的 建立工作场所空气中苯系物的时间加权平均浓度气相色谱测定方法。

Air sample was taken for the determination of arenes (mainly benzene, toluene and xylenes), and the volatile gaseous mixture above the paint-diluent was taken for the analysis of VOC's.

从油漆稀释剂上方的挥发气体中取样用于有机挥发物的分析。

Objectives To explore the indoor air pollution and its health effect s of formaldehyde and BTEX (benzene, toluene, ethylbenzene and xylenes isomers) in the decorative materials in newly decorated rooms.

目的：探讨装饰材料中主要有害物质甲醛及苯系物对室内空气的污染及健康效应。

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。