一酸的

A resin derived from methacrylic acid.A salt or ester of butyric acid.

一种苦味油质的丁酸甘油三酸酯，丁酸甘油酯的一种形式。

A salt or ester of butyric acid .a bitter oily triglyceride of butyric acid; a form of butyrin.

一种苦味油质的丁酸甘油三酸酯，丁酸甘油酯的一种形式。

A bitter oily triglyceride of butyric acid; a form of butyrin.

一种苦味油质的丁酸甘油三酸酯，丁酸甘油酯的一种形式。

An ester or a salt of oleic acid .a bitter oily triglyceride of butyric acid; a form of butyrin.

一种苦味油质的丁酸甘油三酸酯，丁酸甘油酯的一种形式。

Any of several esters, other than the ethyl ester, of carbamic acid .

一种苦味油质的丁酸甘油三酸酯，丁酸甘油酯的一种形式。

A salt or ester of butyric acid.A resin derived from methacrylic acid.

一种苦味油质的丁酸甘油三酸酯，丁酸甘油酯的一种形式。

A new technique for selective plugging and acidizing oil wells is presented based on the principle of temporary plugging and acidizing in which selective plugging agent is first injected to block high permeable zones, then acid is injected to acidize low perlmeable and contaminated ones.

针对暂堵酸化技术存在的问题，提出了一种油井选堵酸化的新技术，即在注酸前注入选堵剂封堵高渗透水层，然后注入酸液以酸化低渗透层和污阻部位。研制了符合最终堵水不堵油要求的选堵剂，描述了这一新技术的机理。通过模拟试验，考察了新型选堵剂的选堵效果、封堵强度及酸化转向率等。

A-Methylnaphthalene contains a methyl group, which is a strong donor group, so the reaction of a-methylnaphthalene with C14 AOS acid had a higher conversion of aromatic than did the reaction of benzene with C14 AOS acid. After alkylaryl sulfonic acid is formed, it will continue to react with another AOS acid to rapidly produce dialkylaryl disulfonic acids owing to the electron- donating effect of the long alkyl chain in the alkylaryl sulfonic acid molecule.

a-Methylnaphthalene包含一个甲基集团，这是一个强大的捐赠团体，所以 a-methylnaphthalene反应出了与C14酸更高的转换的反应比苯与C14活性氧酸。alkylaryl磺酸为后形成，它将继续与另一出酸 dialkylaryl disulfonic迅速产生的电子-酸捐赠的长期效果在alkylaryl烃链磺酸分子。

Erve growth factor can combine with its" receptor (one of tyrosine protein kinase receptor coded by proto - oncogene tyrosine kinase, TrkA), Causing the molecule of receptors to gather on the cell surface, and the tyrosine protein in cytoplasmic domain may be activated, three tyrosine base in the kinase domain of its" receptor and two tyrosine base at other domain be phosphated, thus, phosphated tyrosine receptor kinase became the bracket which absorb all kinds of connective proteins and kinases.

GF与其酪氨酸受体激酶受体(由原癌基因trk编码的一种酪氨酸蛋白激酶受体，TrkA)相结合，引起受体分子在细胞表面发生二聚体化，然后受体细胞内结构上酪氨酸活性被激活，使受体自身结构中位于激酶结构域的三个酪氨酸残基及在此结构域外的两个酪氨酸残基发生自身磷酸化，这样，磷酸化的酪氨酸受体激酶A便成为吸收各种连接蛋白质和酶的支架。

In this dissertation, preparation of polysubstituted ethene and heterocyclic compounds based on 2-hydroxyalkyl phenyl selenides andα-phenylselenopropionic acid reagents were further investigated as follow: Firstly, O-ethyl-O-vinyl phosphonates were prepared in a one-pot, two-step transformation by Mitsunobu reaction of 2-hydroxyalkyl phenyl selenides with monoethyl esters of phosphonic acid in the presence of diethyl azodicarboxylate and triphenyl phosphine (PPh3) followed by oxidation-eliminatio...

中文摘要：本文主要进一步探索了2-羟基烷基苯基硒醚、α-苯硒基丙酸试剂在制备多取代乙烯和杂环化合物反应中的应用，具体研究内容和结果如下：一、在偶氮二羧酸乙酯和三苯膦(PPh3)存在下，苯基-2-羟基烷基硒醚和O-乙基膦酸单酯发生Mitsunobu反应，无需分离和纯化反应中间体，直接使用30 %的双氧水进行氧化-消除反应，提供了&两步、一锅&合成O-乙基-O-乙烯基膦酸酯的新方法，该方法反应条件温和，操作简便，产物收率良好(76-82 %)。

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。