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Acetic anhydride was a very important chemical raw material, which was widely used in many fields of the national economy. There were more preparation methods for acetic anhydride, however, using coal into an important chemical materials was the states key research project.

醋酸酐是非常重要的化工原料，广泛的运用于国民经济多个领域，制备方法比较多，但利用煤炭转化为重要的化工原料是国家重点研究项目。

The recent research shows that the process of acetylation and disacetylation is the key of regulating genes?activity.

最近的研究结果表明，核心组蛋白的乙酰化/去乙酰化过程是调控基因活性的一个关键步骤[1]。

Lysine acetylation is a reversible posttranslational modification of proteins and plays a key role in regulating gene expression.

赖氨酸乙酰化是可逆的蛋白翻译后修饰，在基因表达调控中起重要作用。

Find my key in country-yard is very difficulty seem drag for acicula in the sea.

在院子里找我的钥匙就好像是在大海里捞针一样困难。

Key words: sulfuric acid; electrostatic mist precipitator; design parameter; performance experience

硫酸；电除雾器；设计参数；运行经验

KEY WORDS: ethanol, ascorbic acid, hydroxyl radical, striatum, serotonergic drugs

但它们可以延长乙醇引起的AA释放的时程，同时HO·的生成的增加被抑制。

In this dissertation, the key technologies in the development of the CAD/CAM software based on ACIS geometric engine are studied in depth.

计算机辅助设计与制造技术是近30年来迅速发展起来的新技术，是现代制造技术的重要组成部分。

The processes and the key techniques of the null coupler and acoustic transducers are described and analyzed in detail.

第三部分是光纤声光耦合器和光纤环形器构成的新型OADM 的实验研究。

This dissertation studies the key technique of intelligent mine passive acoustic fuse, according to the demand of...

本文根据反武装直升机智能雷弹研制的需要，深入研究了智能雷弹被动声引信中的几个关键技术。

This dissertation studies the key technique of intelligent mine passive acoustic fuse, according to the demand of the research of weapon against armed helicopter.

本文根据反武装直升机智能雷弹研制的需要，深入研究了智能雷弹被动声引信中的几个关键技术。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。