查询词典 benzene

And 64 of trace VOCs, including 17 USEPA priority controlled pollutants, were detected in the spring and summer samples respectively. Benzene and other monocyclic hydrocarbons had the highest concentrations ranging from 4.25 to 202.35?

结果表明，在春、夏季样品中可分别检测出 47和 64种化合物，其中有些化合物为USEPA优先控制毒害有机污染物；夏季样品中微量挥发性有机污染物的浓度大多比春季样品高，有的甚至高 1个数量级以上。

This study was aimed to investigate whether hydroquinone can inhibit NF-κB expression activated by phorbol myristate acetate, and to explore the relationship between the mechanism and the hematology toxicity of benzene tentatively.

为了研究氢醌（hydroquinone，HQ）对细胞激活剂佛波酯导致的骨髓基质细胞核转录因子表达的影响，并初步探讨其与苯的血液学毒性的关系。

Hydroquinone Inhibits NF-κB Expression in Human Bone Marrow Stromal Cells In Vitro Abstract This study was aimed to investigate whether hydroquinone can inhibit NF-κB expression activated by phorbol myristate acetate,and to explore the relationship between the mechanism and the hematology toxicity of benzene tentatively.

作者：杨海玉，杨建国，王光汉，俞康为了研究氢醌(hydroquinone，HQ)对细胞激活剂佛波酯导致的骨髓基质细胞核转录因子表达的影响，并初步探讨其与苯的血液学毒性的关系。

Poly(ethylene-2,6,-naphthalate) is a newly developed polyester. The chemical structure of PEN can be described by replacing the benzene ring in poly with the stiffer naphthalene ring.

聚萘二甲酸乙二酯是一种近年来获得较大发展的高性能聚酯材料，其分子结构与聚对苯二甲酸乙二酯相类似，可看作是由PET链中苯环由刚性更大的萘环所替代的产物。

HC-402-2 Homogeneous catalyst for benzene hydrogenation is improved through removing water from the catalyst and reducing the content of emulsified material in nickelous isooctanoic acid cyclohexane liquor.

HC - 40 2 - 2型苯加氢均相催化剂经过改进，去除催化剂中的水份，降低异辛酸镍环己烷溶液中乳化物含量后，在保持加氢效果不变的前提下，大幅度提高了催化剂的抗水性能、延长了催化剂的使用寿命。

Except for benzene, hexane, nonane and heptane, the DVP pass ratio values are 77.8%-100%, the DP pass ratio valutes are 66.7%-100%, when sampled 29 other VOCs, which meet the demand for method TO-17 basically.

除了正己烷、正庚烷、苯和正壬炕，以该型采样管采集分析空气中其他29种非卤代烃类VOCs时，其DP合格率为77.8%-100%，DVP合格率为66.7%-100%，基本满足方法TO-17的要求。

Benzene perfluorous nonene ether was prepared by the reaction of perfluo-rous nonene (C9F18) and phenol,and the molecular structure of which was identified by IR and NMR spectra.

以全氟壬烯、苯酚和氯磺酸为主要原料，经醚化、磺化和中和反应制备对全氟壬烯氧基苯磺酸表面活性剂，用红外光谱和19FNMR，1HNMR对分子结构进行了表征。

As a useful fluorinated product,hexafluoropropene trimers can be prepared from hexafluoropropene oligomerization by gas phase-and liquid phase-methods,and many fluorocarbon surfactants such as full-fluoride nonene oxygen benzene sodium can be derived from perfluorinated nonene.

六氟丙烯可通过气相和液相法进行聚合制得六氟丙烯三聚物，即全氟壬烯，全氟壬烯可以进一步衍生出如全氟壬烯氧基苯磺酸钠等多种氟碳表面活性剂，是一种比较有用的含氟产品。

Inside benzene or toluene solvent, in the presence of stannous octoate as catalyst and under the conditions of no water, no oxygen, heating and stirring, MPEG and aliphatic cyclic monomer are ring-opening polymerized to obtain binary block MPEG-aliphatic polyester copolymer.

聚乙二醇单甲醚和脂肪族环酯单体，在苯或甲苯溶剂中，在无水无氧，加热和搅拌的条件下，用辛酸亚锡为催化剂，开环聚合得到聚乙二醇单甲醚-脂肪族聚酯二嵌段共聚物。

Groups in adjacent positions on a Benzene ring are referred to as being "Ortho" one to the other.

在苯环上处于相邻位置的基团，位于相互的&邻位&上。

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。