乙烷

Objective: To establish a reporter gene-based assay for identification of estrogenic compounds in MCF7 cells and study the estrogenic effects of 2,4-DDT and methoxychlor.

目的：建立基於报告基因的MCF7细胞体外雌激素样物质检测方法，并研究2，2-双-1，1，1-三氯乙烷(2，4-DDT)和甲氧氯的雌激素样作用。

When used as butyl rubber reaction solvent and refrigerant respectively, methyl chloride and 1,1- difluoroethane (HFC-152a) have critical requirements for their water contents.

一氯甲烷和1，1-二氟乙烷(HFC-152a)，分别作为丁基橡胶反应溶剂和制冷剂使用时，对其含水量有苛刻的要求。

In this paper, methylal and diethoxymethane were used as end capping agents to improve the thermal stability of the product in molten copolymerization of trioxane with ethylene oxide or with dioxolane.

为此研究了在三聚甲醛与环氧乙烷或三聚甲醛与二氧五环熔融共聚体系中，通过封端剂甲缩醛或二乙氧基甲烷的使用，对热碱稳定的共聚甲醛的收率提高了3％左右。

Flammable media: is mixed with the air less than 10% lower explosive limit, or upper and lower limits of the difference between an explosion equal to 20% greater than the gas, such as a methylamine, ethane, ethylene and so on.

易燃介质：是指与空气混合的爆炸下限小于10％，或爆炸上限和下限之差值大于等于20％的气体，如一甲胺、乙烷、乙烯等。

The adducts of ethylene oxide and propylene oxide are possessed of the majority of nonionic deinking agents. They are the adducts of fatty acid and polyol and monoethanolamine.

在非离子脱墨剂中，环氧乙烷和环氧丙烷的加聚产物占了绝大部分，分别为硬脂肪酸、高碳醇和烷酰醇胺型的加成物。

Epoxyethane ; aqua solution ; tubular reactor ; static mixer ; equilibriumflash vaporization ; ammonia removal ; monoethanolamine synthesis ; testing

环氧乙烷；氨水溶液；管式反应器；静态混合器；平衡闪蒸；除氨乙醇胺合成；试验

This method of measurement requires a hydrocarbon trace gas, in this case ethane, which is delivered to the tunnel mixed with an inert neutrally buoyant carrier gas, in this case nitrogen.

这种测量方法需要碳氢化合物跟踪乙烷在这种情况下，它是提供给混合惰性，在这种情况下，氮的中性浮力载气，隧道气体。

Upon this we measure the conbination energy spectrum and momentum spectrum of valence orbital electron of C2H6. furthmore we get the isolation spectrum of valence orbital electron of N2 and C3H8 for the first time.

在此基础上，测量得到乙烷分子(C_2H_6)价轨道电子的结合能谱和动量谱，并用EMS方法测量得到氮分子(N_2)和丙烷分子(C_3H_8)价轨道电子的电离能谱。

With trimethyl,4-dodecylbenezyl ammonium chloride and 18-crown-6 as pase-transfer catalysts, the azidation of polyepichlorohydrin in poly and H2O were studied. The reaction discipline and mechanism were discussed. The results show that the system with trimethyl, 4-dodecylbenezyl ammonium chloride as phase transfer catalyst and PEG as medium is a safe and effective approach to glycidyl azide polymer preparation, and azidational ratio of PECH can reach 97% above within 15 h.

研究了氯化十二烷基苄基三甲基铵和18-冠－6为相转移催化剂时端羟基聚环氧氯丙烷在聚环氧乙烷和水为介质中的叠氮化反应，探讨了反应规律和反应机理，结果表明：以PECH为介质，十二烷基苄基三甲基氯化铵(TMDA-1)为相转移催化剂的反应体系，可在15h内使PECH叠氮化转化率达到97%以上，无主链断裂等副反应，是一条较为安全快速的制备叠氮粘合剂的方法。

From this perspective, flammable ice can be regarded as the natural gas in the highest purity, and you know, the general state of the natural gas, methane is only about 92% less, in addition to about 3% of the ethane, about 2% of the nitrogen and about 1% of the propane, as well as a very small amount of butane, pentane and oxygen and so on.

从这个角度说，可燃冰可算是自然中纯度最高的天然气了，要知道，一般状态下的天然气中，甲烷大约只占92%不到，此外还有3%左右的乙烷、2%左右的氮气和1%左右的丙烷，以及极少量的丁烷、戊烷和氧气等。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。