取代物

ABSTRACT Homopolymerization and copolymerization of substituted acetylenes with different polarity by the transition metal acetylide complex catalysts PPO, Pd (PPh〓〓〓; PPB, Pd〓 C≡CC (CH〓〓OH 〓etc.

首次以过渡金属钯-炔配合物为催化剂（PPO，Pd〓〓；PPB，Pd〓〓等），实现了具有不同极性取代乙炔单体的均聚和共聚。

But that was a little weighty for everyday use, so in 1953 the acronym UFO was coined to replace it.

但是，这一点对于日常使用的分量，所以在1953年创造的不明飞行物是来取代它的缩写。

An organic compound in which the hydrogen of the hydroxyl group of methyl alcohol is replaced by a metal.

甲基化产物一种有机合成物，是甲醇的羟基中的氢被一种金属取代

The homologs of benzene are those containing an alkyl group or alkyl groups in place of one or more hydrogen atoms.

苯的同源物是于苯环中一个或多个氢原子的位置上以烷基取代的化合物。

Anaclisis thus refers to from of libidinal displacement by the subject.

因此Anaclisis意指一种对于某物的性欲取代。

Part two, Three analogue compounds of actamiprid were synthesized by analogue synthesis method through the intermediates which have insecticide activity.

第二部分中，选取本身具有杀虫活性的基团取代吡虫清中的2-氯-5-氯甲基吡啶，采用"类同合成法"合成了3个烟碱类杀虫剂吡虫清的类似物。

When the proportion of the aryl halides was changed,the aromatic products with different number substitutes could be obtained.

通过研究我们发现，活泼酰基与烯丙基在偶联反应中活性相当，可得到不同成环方式的产物，且当改变卤代物比例时，将得到不同数量取代芳烃的产物。

It can act as a simple asphyxiant by displacing the oxygen in air to levels below that required to support life.

通过取代空气中的氧，使之下降到维持生命所必须的水平以下，它可以成为简单的窒息物。

Although helium is nontoxic and inert, it can act as a simple asphyxiant by displacing the oxygen in air to levels below that required to support

尽管氦无毒且不活泼，通过取代空气中的氧，使之下降到维持生命所必须的水平以下，它可以成为简单的窒息物。

Although helium is nontoxic and inert, it can act as a simple asphyxiant by displacing the oxygen in air to levels below that required to support life.

尽管氦无毒且不活泼，通过取代空气中的氧，使之下降到维持生命所必须的水平以下，它可以成为简单的窒息物。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。