甲烷

Methanol. Chloromethane.

甲醇。氯甲烷。

A new chiral quaternary ammonium salt 1a was synthesized by the reaction of cinchonine and(2,4,6-)trimethyl benzyl chloride.Etherification between 1a and benzyl bromide,allyl chloride,or methyl give corresponding etherified quaternary ammonium salts 1b,1c,and 1d.

由辛可宁和2，4，6-三甲基苄氯，合成了一种新的手性季铵盐(1a)，并进一步用苄基溴、碘甲烷和烯丙基氯对分子中的羟基进行醚化，得到相转移催化剂1b、1c和1d。

But instead of a delicious snack-food the clathrate is water covered methane.

但是它不是可口的零食。这里的包合物是指水包着甲烷。

Gas hydrates are defined as the crystalline solid, or clathrate hydrates, which are formed by some types of low mass molecular gases, such as methane, carbon dioxide, and hydronitrogen et al, with water under relatively high pressure and low temperature conditions.

天然气水合物是一些具有相对较低分子质量的气体如甲烷，二氧化碳、氮气等在一定温度和压力条件下与水形成的内含笼形孔隙的冰状晶体。

China, Russia, Poland and the United States account for over 77 percent of coal mining methane emissions.

中国，俄罗斯，波兰和美国所占比例超过77 %的煤炭开采甲烷的排放量。

For every ton of coal produced, during the "coalification" process, more than 5000 cubic feet of methane is created.

每万吨煤的生产，在"煤"的过程中，超过5000万立方英尺的甲烷产生。

Methane is a kind of colorless gas.

甲烷是一种无色气体。

The effects of methane concentration on the growth of (100) texture diamond film have been investigated.

研究了不同的甲烷浓度对金刚石薄膜(100)织构生长趋势的影响。

And, when atmospheric methane condenses, it makes fog.

当大气中的甲烷凝结就形成了雾。

By using a transient method and fine constantan thermocouples of 0.2mm in diameter,the effective thermal conductivities of sulfur-resisting methanation catalysts have been measured between 313K and 533K.

本文采用动态法原理，用单丝直径为0.2mm的铜－康铜热偶作为测温元件，在313～533K温度区间，测定了耐硫甲烷化催化剂的有效导热系数。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。