甲烷

Coal is one of porous media and during the process of its formation both a great volume of methane and quantity of water generated.

煤是一种多孔介质，在其形成过程中生成了大量的甲烷，并含有大量的水份。

In a 4×4 latin square design four steers (500±50) kg with permanent rumen and abomasum cannulae were fed on the different type of diets to study the effects of fiber digestion and VFA in the rumen on the methane production.

装有瘤胃和真胃瘘管的成年阉牛4头，体重（500±50）kg，采用4×4完全拉丁方试验设计，在呼吸代谢室内就不同日粮的纤维消化、瘤胃内VFA对甲烷产生量的影响进行了研究。

There were obviously more chafers near the castor-oil plant than soybean, cotton, sweet potato, peanut, elm, Abutilon theophrasti Medic, there was significant difference between them.

华北大黑鳃金龟对不同植物挥发性物质的选择反应(1)采用水蒸气蒸馏法，二氯甲烷萃取，提取植物叶片的挥发性物质，无论对雌虫还是雄虫，蓖麻叶粗提物的诱虫活性均显著高于棉花、苘麻叶片粗提物。

Acetonitrile was used as the solvent in the first stage of the concentration process.

以氰化甲烷作为第一阶段浓缩的溶剂。

The studies segmented polyester polyurethaneurea elastomers based on 4,4'-diphenylmethane diisocyanate, ethylene diamine and polybutylene adipate (M. W. 1975 and M. W. 1228) were studied by means of IR spectrascopy.

用红外光谱法对基於4，4'-二苯基甲烷二异氰酸酯、乙二胺和聚己二酸丁二醇酯（分子量分别为1975和1228）的嵌段聚脲氨酯弹性体进行了研究。

Lastly, the impact factors of methane flux are summarized, including biotic and abiotic factors.

湿地甲烷通量是由多种因素决定的，对影响湿地甲烷通量的因素的研究相当丰富，特别是近年来对生物因素的关注。

Liquid oxygen/methane engine has higher performance and methane has good regenerative cooling performance, so it is a preferred alternative propellant combination .

液氧/甲烷发动机具有较高的性能，甲烷有好的再生冷却性能，是一个可供选择的推进剂组合。

They reckon it has always contained a lot of nitrogen, but that earlycarbon dioxide was mopped up by the formation of limestone while methane levelsrose as a result of the exhalations of a group of bugs—then common, nowrare—called methanogens.

他们估计大气层中已经有很多的氮素，而早期的二氧化碳是石灰石的形成释放出来的，与此同时，在当时极为普遍的产甲烷菌还源源不断的释放出甲烷气体。

It was found that the goods with different physics property indeed affected the concentration distribution of the methyl bromide.

通过货物不同物理属性对溴甲烷气体分布规律的研究，发现不同货物的吸附性、可通透性等物理特性影响箱内溴甲烷气体浓度变化。

Synthesis of methylene-4,4'-di catalyzed by zinc oxide Various metal oxide were investigated in the synthesis of methylene-4,4'-di from ethyl carbamate, and a serious of ZnO/SiO2 catalysts were prepared by deposition-precipitation method.

氧化锌为催化剂合成4，4'-二环己基甲烷二氨基甲酸乙酯以氨基甲酸乙酯和4，4'-二环己基甲烷二胺的反应体系为研究对象，在考察多种金属氧化物活性的基础上，使用沉积沉淀法制备了一系列硅胶负载氧化锌催化剂，并对其催化性能进行了研究。

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。