答：科学家们已经识别出五种截然不同的肝炎病毒并以甲、乙、丙、丁、戊型作为辨识。虽然它们都会引起肝病，但在重要方面又有所不同。
A: Scientists have identified five unique hepatitis viruses, identified by the letters a, b, c, d, and E. While all cause liver disease, they vary in important ways.
科学家们已经识别出五种截然不同的肝炎病毒并以甲、乙、丙、丁、戊型作为辨识。虽然它们都会引起肝病，但在重要方面又有所不同。
Scientists have identified five unique hepatitis viruses, identified by the letters A, B, C, D, and E. While all cause liver disease, they vary in important ways.
本文研究了聚丙烯酸丁酯／聚甲基丙烯酸乙酯核／壳结构弹性体粒子对HIPS的增韧作用，提出了一个新的增韧机理。
The toughening of HIPS is studied by blending it with a polybutylacrylate/polyethylmethacrylate core/shell structure elastomer particles, an a new mechanism of toughening isproposed.
摘要目的：建立一种气相色谱法同时测定注射用青霉素钠中有机溶剂丁醇、乙酸乙酯、乙酸丁酯残留量的方法。
To found a method to detect the residual solvents of penicillin sodium for injection: butanol acetic ether and butyl acetate.
在反应中得到较短碳链的D -葡萄糖苷，如甲苷、乙苷、正丁苷和正戊苷，而不能得到长链的正十二烷基D -葡萄糖苷。
The shorter chain alkyl D glucosides such as methyl , ethyl , n butyl, and n penthyl D glucosides, but no long chain n dodecyl D glucoside, are obtained during reactions.
生物法生产手性乙偶姻及(2s,3s) - 2,3 -丁二醇的研究。
Study on Production of Chiral Acetoin and (2s, 3s) -2, 3-butanediol by Biocatalysis.
采用直接酯化法，将山梨酸与四种醇反应，合成了山梨酸甲酯、乙酯、丙酯、丁酯。
Methyl, ethyl, propyl and butyl sorbates were synthesized by esterification of sorbic acid with four kinds of alcohol respectively.
上述条件下，尼泊金乙酯的产率为87.5% ，尼泊金丙酯的产率为89.2 % ，尼泊金丁酯的产率为91 .1 %。
Under this conditions, the yield of ethyl ester, propyl ester and butyl ester respectively is 87.5%, 89.2% and 91.1%.
应用紫外差光谱和荧光光谱法研究了水溶液中酰胺类除草剂乙草胺、丙草胺、丁草胺、异丙甲草胺与脲酶分子间的相互作用。
The binding of acetochor, pretilachor, butachlor and metolachlor to urease in aqueous solution was studied using UV difference spectrum and fluorescence spectrum methods.
上述条件下，尼泊金乙酯的产率为85% ，尼泊金丙酯的产率为94 % ，尼泊金丁酯的产率为92 %。
Under this conditions, the yield of ethyl esters was 85%, propyl ester 94% and butyl ester 92%.
讨论了正硅酸乙酯溶胶和钛酸丁酯溶胶混合溶胶的固色效果及固色工艺对固色效果的影响。
The fixing performance of TEOS/ TBB blend sol and the effect of fixing conditions were discussed.
所述钛盐是指钛酸甲酯、钛酸乙酯、钛酸四丁酯、四氯化钛、硫酸氧钛中的任一种；
The said titanate is one of the kinds such as methyl titanate, ethyl titanate, butyl titanate, titanic chloride and titanoxy sulfate.
前言：目的：建立一种气相色谱法同时测定注射用青霉素钠中有机溶剂丁醇、乙酸乙酯、乙酸丁酯残留量的方法。
Objective: to found a method to detect the residual solvents of Penicillin Sodium for Injection: butanol, acetic ether and butyl acetate.
上述乙、丙和丁类车辆，附带其车辆并非小拖车。
Motor vehicles of category B, C or D, as autorized above with other that a light trailer.
酯合成反应的目标产物为乙酸乙酯或乙酸正丁酯；
The target product from ester synthesis reaction is ethyl acetate or n-butyl acetate.
目的：研究一个能同时测定空气中苯、甲苯、二甲苯、乙酸乙酯、乙酸丁酯等有机毒物的检测方法，用以对新装修旅店客房有机毒物含量分析。
Result:Organic poisons such as benzene, xylene, methylbenzene, ethyl acetate and butyl acetate could be separated effectively by column FFAP, the ralative standard deviation of the method was 1.
上述条件下，对羟基苯甲酸乙酯的产率为87.5%，对羟基苯甲酸丙酯的产率为89.2%，对羟基苯甲酸丁酯的产率为91.1%。
Under these conditions, yields of 87.5%, 89.2%and 91.1%can be reached for the ethyl ester, propyl ester, and butyl ester, respectively.
乙酸丁酯、乙酸3 -甲基丁酯、乙酸丙酯、乙酸乙酯、1 -丙醇、1 -丁醇、2 -甲基丁醇和2 -甲基丁酸乙酯为新红星苹果果实的主要香气成分。
Starkrimson fruit aroma comprised butyl acetate, 3-methyl-butyl acetate, propyl acetate, ethyl acetate, 1-butanol, 1-propanol, 2-methyl-butanol and ethyl 2-methyl-butanoate.
西司他丁钠的合成以乙酰乙酸乙酯和1-溴-5-氯戊烷为原料，经活性亚甲基烃化、成肟和水解3步反应得7-氯-2-氧庚酸乙酯；
The synthesis of Cilastatin sodium started from ethyl acetoacetate and 1-bromo-5-chloropentane, through 3 steps to produce ethyl 7-chloro-2-oxoheptanoate;
应用紫外差光谱和荧光光谱法研究了水溶液中酰胺类除草剂乙草胺、丙草胺、丁草胺、异丙甲草胺与脲酶分子间的相互作用。
The binding of metolachlor and S Isomer to urease in aqueous solution was studied using UV difference spectrum and fluorescence spectrum.
个别高档油墨用乙酸乙酯挥发速度太快，用乙酸正丁酯有气味残留，乙酸异丙酯是非常好的油墨溶剂。
The volatility of some specific high-end printing inks are fast as they use EAC and some of their smell bad as they use BAC, so isopropyl Acetate is a good solvent of high-end printing ink.
上述条件下，对羟基苯甲酸乙酯的产率为87.5%，对羟基苯甲酸丙酯的产率为89.2%，对羟基苯甲酸丁酯的产率为91.1%。
Under these conditions, yields of 87.5%, 89.2%and 91.1%can be reached for the ethyl ester, propyl est...
丁酰乙酸乙酯； 3-氧代己酸乙酯；
丁酰乙酸乙酯； 3-氧代己酸乙酯；
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