摘要：聚氯乙烯可由乙烯、氯和催化剂经取代反应制成。
Abstract: Polyvinyl chloride can be made by ethylene, chlorine and catalyst through substitution reaction.
以茶碱为原料经取代、氧化和缩合反应制备多索茶碱；其结构为IR及MS所证实。
Doxofylline was synthesized from theophylline by substitution, oxidation and condensation. The structure has been proven by IR and MS.
经取代的2，4-二氨基-1，3，5-三嗪类化合物、其制备方法及其用作除草剂和植物生长调节剂的用途。
Substituted 2,4-diamino-1,3,5-triazines, methods for the production thereof, and use thereof as herbicides and plant growth regulators.
没有经海上捷径从非洲到意大利的主要原因是，当时罗马人已取代了迦太基人当上了地中海霸主。
But the principal reason for not making the short sea crossing from Africa to Italy was that by then the Romans had replaced the Carthaginians as the masters of the Mediterranean.
《国际循环》：那么您认为将来经皮高血压治疗术是否会完全取代高血压药物治疗呢？
International Circulation: So do you think that in the future this percutaneous treatment is going to replace medicine for the treatment of hypertension totally, or are we not going that far?
结论：经皮气管切开术具有安全、简单、快速、创伤小、花费低廉的优点，可基本取代传统的气管切开术。
Conclusion: Percutaneous tracheostomy is more quick, safe and simple, with minor injury and cost less, which can take the place of traditional tracheotomy.
经临床使用，本系统能取代专业图像工作站的部分功能。
By the verification of clinic use, this system can replace some functions of a professional graphic workstation.
经样机试验表明，采用涡流电导率原理的烧伤检测仪具有操作简单、检测结果准确可靠的特点，完全可取代传统的烧伤检测方法。
Practical running shows that new burn inspector can replace traditional method of burn inspection completely because of its simple operation and high dependability.
以乙醇胺为起始原料，经亲核取代、肖特一鲍曼反应和缩合反应制得吗氯贝胺，总收率可达71.2%。
Moclobelide was synthesized from ethanolamine by nucleophilic substitution and Schotten-Baumann reaction, followed by condensation with an overall yield of 71.2%.
经处理后的表面非常良好，可取代蚀花加工。
Good surface appearance after EDM process which the etching process can be replaced.
所得的三环化合物经热分解和加氢反应，制备顺式和反式- 2,5 -二取代四氢呋喃。
The cis - or trans-2, 5-disubstituted tetrahydrofurans were provided by the hot decomposition and then hydrogenation of tricycle compounds produced.
以水为溶剂，取代芳磺酸为拆分剂，用诱导结晶法，经成盐、拆分、水解过程，将DL-对羟基苯甘氨酸拆分成D-对羟基苯甘氨酸。
The resolution of DL p hydroxyphenylglycine into its D and L isomers was studied by using aromatic sulfonic acid as resolving agent and water as solvent.
本文报道了以邻氯甲苯为原料，经光氯化、水解、取代三步合成2-甲酰基苯磺酸钠的方法，并对影响反应收率的因素进行了讨论。
Sodium 2-formylbenzenesulfonate was prepared from 2-chlorotoluene by photo-chlorination, hydrolysis and substitution reactions successively. Factors affecting the yields were discussed.
目的探讨改进合成普拉洛芬的方法方法以2-氯烟酸原料经缩合、还原、取代、酰化等制得普拉洛芬。
Objective To study the synthetic method of pranoprofen. Methods Pranoprofen was synthesized from 2-chloronicotinic acid by condensation, reduction, substitution and acylation.
以2,3 -二氯苯胺为原料，经3步亲核取代反应合成了阿立哌唑。3步反应的收率分别为83%，91%和90%；总收率68%。
Aripiprazole in overall yield of 68% was synthesized from 2, 3-dichloroaniline by a three-step nucleophilic substitution reaction in yield of 83%, 91% and 90%, respectively.
本协议经双方一致协商同意，可取代任何其它口头或书面协议，未经双方书面同意，不得以任何方式变更。
This Agreement contains the entire understanding of the parties, supersedes any other oral or written Agreements and may not be modified in any way without the written consent of both parties.
方法以苯乙酸为原料，经磺化、拆分、酰化、酰胺化和取代五步反应合成头孢磺啶。
METHODS Cefsulodin was prepared, taking phenylacetic acid as the starting material, followed by sulfonation, resolution, acylation, amidation and substitution, in 5 steps totally.
用二（三氯甲基）碳酸酯（BTC）代替光气，“一锅法”合成了8种取代脲类除草剂，产物结构经元素分析、IR确证。
Eight substituted ureas herbicides were synthesized with bis(trichloromethyl) carbonate(BTC). The production structures were identified by elemental analysis and IR.
研究了原料性质、试剂用量、反应条件等对产品性能的影响，制备出具有不同取代度的产品，经多方药理验证，产品具有提高免疫功能的作用。
The conditions of reaction were discussed. The effects of CMMH on immune function were examined by pharmacological experiments. Results show that CMMH can...
研究了原料性质、试剂用量、反应条件等对产品性能的影响，制备出具有不同取代度的产品，经多方药理验证，产品具有提高免疫功能的作用。
The conditions of reaction were discussed. The effects of CMMH on immune function were examined by pharmacological experiments. Results show that CMMH can...
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