丁基

As superplasticizer , a series of comb-shaped copolymers of polycarboxylic acid were synthesized by polyoxyethylene allyl methyl diether, maleic anhydride, and styrene with different initiators,and esterified with PEO-n.

以聚氧乙烯甲基烯丙基二醚、顺丁烯二酸酐、苯乙烯等为共聚单体，采用不同引发剂，合成了一系列聚羧酸型梳状共聚物超分散剂，并以PEO n单酯化得酯化产物，研究了共聚物的结构、组成、添加量等对水泥粒子分散性能的影响。

A novel method for synthesis of-4-cyano-3-hydroxybutyric acid ethyl ester (1), a key intermediate of statins, was reported.

研究了一条新的路线用于他汀类药物的重要中间体-4-氰基-3-羟基丁酸乙酯的合成。

Objective: To synthesize 2-benzyloxy-5-fluoro-4-oxo-pyrimidine-3-butyric acid ethyl ester, the key intermediate in the synthesis of fluorouracil derivatives.

目的：合成氟尿嘧啶类衍生物合成中的关键中间体2-苄氧基－5-氟－4-嘧啶酮－3-丁酸乙酯。

One compound is identified as the title compound 2-benzyloxy-5-fluoro-4-oxo-pyrimidine-3-butyric acid ethyl ester, and the other one is its formula isomer.

通过IR谱确证一个化合物是目标物2-苄氧基－5-氟－4-嘧啶酮－3-丁酸乙酯，另一化合物是它的同分异构体。

In the pharmaceutical aisles, I found 61 varieties of untan oil and sunblock , and 80 different pain relievers —aspirin, acetaminophen, ibuprofen; 350 milligrams or 500 milligrams; caplets, capsules, and tablets; coated or uncoated.

在药品的过道上，我发现有61种不同的untan 油和防晒霜，还有80种止痛药——阿司匹林，乙醯胺基酚，异丁苯丙酸，还分350毫克和500毫克；还有囊片，胶囊，药片，其中还分有有包裹层和没有包裹层的。

Treatment of hepatocytes with clofibrate caused a significant increase in intracellular and mitochondrial ROS.

用氯贝丁酯处理过的肝细胞及线粒体内自由基显著增加。

Segmented polyester polyurethaneurea based n 4, 4'-disphenylmethane diisocyanate, ethylene diamine and polybutylene adipate elastomers and their deuterated polymers were studied by means of IR spectroscopy.

用红外光谱法对基於4，4'-二苯基甲烷二异氰酸酯、乙二胺和聚己二酸丁二醇酯的嵌段聚酯型聚脲氨酯弹性体及其氘化產物进行了研究。

These results show that the ring expansion of cyclopropylsilylene C3H5SiH to silacyclobutene is easy to occur with a barrier of 113.4kJ/mol, while the 1,2-H shift is not competitive to the ring expansion for its much higher barrier.

结果表明，环丙基硅烯经过113.4kJ/mol的势垒扩环重排为硅杂环丁烯为自发反应；而其1，2-氢迁移重排反应热垒为190.0kJ/mol，是非自发反应，难于进行，不能与扩环重排相竞争。

The best of them – the String Quintet in F minor, for example – reveal a well-formed, even precocious, musical personality.

鲍罗丁与他杰出的同代人穆索尔斯基相似，擅长于从吸收西方大师的作品中学习作曲。

In this thermodynamic study, the minimum requirements in molar fraction of the solvents (x3) on the azeotropic feed plate are: 0.20 for N,N-dimethylformamide, 0.36 for 2-ethoxyethanol, 0.40 for 1-pentanol and 0.66 for butyl propionate,.

在这个热力学研究中，共沸混合物喂料盘上各溶剂摩尔分数最小值(x3)分别是：N，N-二甲基甲酰胺：0.20；2-乙氧基乙醇：0.36；1-戊醇：0.40；丙酸丁酯：0.66。

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。