乙酸

Monochloroacetic acid is a rather important chemical raw material and organic intermediate product, which is mainly manufactured by chloride of acetic acid using sulfur and anhydride acetic acid as catalyst.

氯乙酸是一种及其重要的化工原料和有机中间体，目前氯乙酸主要以硫磺或醋酐为催化剂进行乙酸氯化生产而得。

By using gas chromatography technique nine kinds of fragrance components(acetic aldehyde,ethyl acetate,ethanol,propyl acetate,3-hydroxy-2-butanone,acetic acid,furfural,metacetonic acid,2,3-butylene glycol)were measured quantitatively in different kinds of Shanxi overmature vinegar and the other kinds of vinegar.

应用气相色谱方法对山西老陈醋和其他种类醋的9种香气成分(乙醛、乙酸乙酯、乙醇、乙酸丙酯、3-羟基-2-丁酮、乙酸、糖醛、丙酸、2，3-丁二醇)进行了定性、定量测定，并用聚类分析、模糊综合评判、方差分析、回归分析的方法对实验结果进行了数理分析。

A new imidazolinyl intermediate is prepared from phenylacetic acid and diethylenetriamine firstly, and then they react with the solution of sodium chloroacetate into the imidazolinyl quaternary ammonium salt.

以二甲苯为溶剂，苯乙酸和二乙烯三胺为原料，经酰胺化和环化脱水合成了新型咪唑啉化合物，并用氯乙酸钠溶液对其进行改性得到了苯乙酸咪唑啉季铵盐。

2 It was found that there was clear inhibitory effect on hypha and sporangia during a 7-day period when doses of 200 and 400Gy were used, but little on conidia and chlamydospores.

苹果用 射线辐照后，其乙酸乙酯被分解，但对照乙酸乙酯纯品不受影响。问题：注意纯品乙酸乙酯是作对照的，说明也已被照射。而在译文中没有反映出来，显然是一个无效判断（Null judgement。

Water samples were extracted and purified and collected by solid-phase extraction LC-18 column. Soil samples were extracted by ethyl acetate/petroleum ether (2:1, by vol) and purified by sulphonation. Wheat sample was extracted by acetonitrile/water (4:1, by vol) and purified and collected by SPE- Florisil column.

水样直接用LC-18固相萃取小柱分离、净化和富集；采用乙酸乙酯／石油醚（体积比2：1）振荡提取，磺化法净化，测定土壤中氯氟吡氧乙酸残留量；以乙腈／水（体积比4：1）为提取剂，氟罗里硅土固相萃取小柱分离、净化，测定小麦样品中氯氟吡氧乙酸的残留量。

Polyester nanofiber can be prepared by electrospinning process from PET chips separately dissolving in three kinds of solvents,namely,the mixture solvent of phenol and tetrachloroethane ,trifluoroacetic acid and the mixture solvent of trifluoroace- tic acid and dichlormethane.

利用静电纺丝法制备聚酯纳米纤维，选择苯酚和四氯乙烷，三氟乙酸，三氟乙酸和二氯甲烷3种溶剂分别溶解PET切片进行静电纺丝，通过扫描电子显微镜对纤维表面形态进行观察，结果表明：三氟乙酸和二氯甲烷混合溶剂溶解PET制备的电纺纤维较好。

Preparation of trifluoroacetaldehyde and trifluoroacetic acid by trifluoroethanol catalytic oxidation;2. Polyester nanofiber can be prepared by electrospinning process from PET chips separately dissolving in three kinds of solvents,namely,the mixture solvent of phenol and tetrachloroethane, trifluoroacetic acid and the mixture solvent of trifluoroace- tic acid and dichlormethane.

利用静电纺丝法制备聚酯纳米纤维，选择苯酚和四氯乙烷，三氟乙酸，三氟乙酸和二氯甲烷3种溶剂分别溶解PET切片进行静电纺丝，通过扫描电子显微镜对纤维表面形态进行观察，结果表明：三氟乙酸和二氯甲烷混合溶剂溶解PET制备的电纺纤维较好。

The effect of three hormones on bulb scale propagation of two lilium oriental cultivars 'Sorbonne' and 'Tiber' was studied. The three hormones were IBA+2%NAA, IAA and NAA. The concentration were all 150 mg/L.

将'索蚌'和'提伯'两个百合品种的鳞片在浓度为150 mg/L的吲哚丁酸＋2%萘乙酸、吲哚乙酸和萘乙酸三种激素中浸泡处理后，再进行鳞片包埋繁殖试验。

Treatment of sucrose alkyl 4,6-orthoacetate hexaacetates I with water or alcohol in the presence of an acid catalyst afforded derivatives of sucrose acetates by selectively blocking specific hydroxyl group in sucrose and acetyl migration.

4，6-原乙酸蔗糖六乙酸酯在酸催化下水解和醇解，选择性地保护了蔗糖分子中的某些羟基，并通过乙酰基由C~4→C~6迁移的异构化反应合成了一系列蔗糖乙酸酯。

And the application of glycollic acid in the fields of chemical cleaning, auxiliaries and materials were introduced in detail.

概述了羟基乙酸几种主要工业合成方法的工艺条件及存在的主要问题，即氯乙酸水解法、氰化法、甲醛羰基化法和一氯乙酸钾水解法。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。