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external double bond 外双链
The Alkene Double Bond: A Focus of Reactivity. 21烯烃的双键：重点是反应活性。
One atom of oxygen is linked to the nitrogen atom by a double bond. 一个氧原子以双键与氮原子相连。
Compared with diolefine rubber,EPDM has less double bond. 与二烯烃橡胶相比,EPDM的双键很少。
An organic compound containing many double bonds. 多烯一种包含许多双键的有机化合物
In the ethyne molecule, a double bond links together the two carbon atoms. 在乙烯分子中是由一个双键将两个碳原子连结在一起的。
The triple bond does not usually react so vigorously at a carbon-carbon double bond. 三键在反应时一般不象烯烃中的碳-碳双键那样剧烈。
The molar absorbance at 350 nm increases if the aldehyde contains a double bond. 如果醛含一个双键,则摩尔光吸收在350nm处增加。
Oxazolidine, which has both double bonds reduced. -{恶唑}-啉，其中一个双键被还原。
They react by adding other chemical agents at the double bond to form derivatives or polymers. 这些化合物的最大用途在于双键与其它化学物质的反应。
Title： Determination of Double Bond Position in Conjugated Dienes in Sex Pheromones of Dendrolimus SPP. 关键词：4-甲基-1,2,4-三唑啉-3,5-二酮;共轭双键;气相色谱-电子轰击质谱;性信息素;云南松毛虫
One is the Rutin.The other is carotenoids consisting of double bond, carbonyl and hydroxyl. 黄酮成分主要是芦丁，类胡萝卜素具有双键、羰基和羟基。
The process involves two molecules that each contain a double bond between carbon atoms. 这个过程涉及两个分子，即每个碳原子之间都包含了一个双键。
Abstract Fatty acid desaturases catalyze the insertion of a double bond at the delta position of fatty acids. 摘要脂肪酸去饱和酶是催化脂肪酸链特定位置形成双键和产生不饱和脂肪酸的酶类。
Monounsaturated fatty acid(MUFA) is a sort of fatty acids, including a double bond in its carbon chain. 单不饱和脂肪酸(MUFA)是脂肪酸的一种,其碳链上只有一个双键。
Compounds containing two double bonds are called dienes. 包含两个双键的化合物叫做二烯烃。
FITR shows that the quality degeneration is mainly caused by double bond rupture in modifier. 傅立叶红外光谱分析表明，改性沥青老化后性能下降主要是改性剂中双键断裂造成的。
In addition, the reaction mechanism of double bond isomerization of butene catalyzed by HF has been investigated. 此外，对氟化氢催化丁烯的反应机理进行了探索研究，为研究水滑石催化反应机理打下基础。
External double deck floating roof tank 双盘式外浮顶油罐
In cases of doubt the changes following hydrogenation, bromination or other chemical attack upon the double bond can be studied. 在有疑问时可以研究双键的氢化，溴化或其他化学反应所引起的变化。