丙烷

Biological activity of the compounds were studied and the result indicated that the compound 1,1'-ethyl dicarboxylate gem-dimethyl-cyclopropanediacylhydrazine has good activity against bean aphidsin at 250mg/L.

生物活性测定结果表明，在250mg/L的浓度下，化合物1，1'-二羧酸乙酯偕二甲基环丙烷双酰肼对蚕豆蚜虫有较好杀虫活性。

Three series of segmented polyurethanes were synthesized, which are based on 4,4'-methylene-di, N-methyl diethanolamine and hydroxy terminated poly-butadiene, poly or poly.

本文讨论了以聚环氧乙烷、聚环氧丙烷以及聚丁二烯为软段，以4，4'-二异氰酸二苯甲烷和N，N-二羟乙基甲胺为硬段的链段型聚氨酯的合成。

The aminolignin flocculant was prepared based on calcium lignosulfonate, diethylamine and epichlorohydrin by amino grafting.

摘要以木质素磺酸钙、二乙胺和环氧氯丙烷为原料，通过接枝氨基，合成了木质素胺脱色絮凝剂。

An organic cationic flocculant containing quaternary ammonium ion was synthesized using epichlorohydrin, diethylamine and 1, 2-diaminoethane as raw materials. The intrinsic viscosity, charge density and turbidity removal rate of PEFD were determined and its structure was characterized by FT-IR.

以环氧氯丙烷、二乙胺和乙二胺为原料合成了有机阳离子絮凝剂PEFD，对其电荷密度、特性粘度以及絮凝性能进行了测试，并采用红外光谱对其结构进行了表征。

The castor oil based polyurethane potting materials were synthesized from castor oil,4,4 diphenylmethane diisocyanate,trimethylolpropane and 1,2 propanediol.

以蓖麻油，4，4' -二苯基甲烷二异氰酸酯、三羟甲基丙烷与 1，2 -丙二醇为原料合成了蓖麻油基聚氨酯灌封胶，研究了灌封胶的固化流变行为和凝胶化时间。

Chapter 1: The reactions of methylenecyclopropanes with phenylsulfenyl chloride or phenylselenyl chloride give cyclobutene derivatives along with ring-opened products in good total yields at 0 °C in various solvents. The reactions of methylenecyclopropanes with diphenyl diselenide give the di-phenylselenyl substituted ring-opening products which can be transformed to 2,5-dihydrofuran derivatives under the oxidation with hydrogen peroxide at room temperature.

在第一章中，我们发现亚甲基环丙烷类化合物在0℃时即可很快与苯硫氯或苯硒氯发生反应生成取代环丁烯类化合物和正常的开环产物；而与二苯基二硒的反应则需加热到150℃以上才能进行反应，生成的二苯硒基开环产物在双氧水氧化下可以转化为取代二氢呋喃类化合物。

An alicyclolic epoxy resin with endocyclic structure,namely hydrogenated terpinene-maleic ester type epoxy resin, was synthesized from the raw material hydrogenated terpinene-maleic anhydride.

以氢化萜烯马来酸酐为原料与环氧氯丙烷反应合成一种含桥环结构的饱和脂环基环氧树脂——氢化萜烯酯型环氧树脂。

Using pentaerythritol as initiator, boron trifluoride diethyl etherate as catalyst.dichloroethane as dispersion agent, the chloride polyether polyol is synthesized based on the mechanism of cationic ring-opening polymerization of epiclilnrohyclrin.The azide polyether polyol is synthesized, in DMF through A and sodium azide, and the non-reported azide energetic curing agent is synthesized through the adduction of B and IIDI.

以季戊四醇为起始剂，三氟化硼乙醚为催化剂，1，2—二氯乙烷为分散剂，环氧氯丙烷经阳离子开环聚合反应制成氯化聚醚多元醇，A在N，N—二甲基甲酰胺中与叠氮化钠反应制得叠氮聚醚多元醇，B与六亚甲基二异氰酸酯加成反应制得未见文献报道的叠氮固化剂。

The thermodynamic functions of NO removal by low carbon hydrocarbons such as methane, ethane, ethene, ethine, propane and propene are calculated,and enthalpy changes of reaction producing activated particles from low carbon hydrocarbons in electric field are calculated to find out the appropriate low carbon hydrocarbons for removing NO.

通过计算甲烷、乙烷、乙烯、乙炔、丙烷和丙烯等低碳烃与NO反应的热力学函数和低碳烃在电场作用下产生活性粒子的反应焓变，找出合适的低碳烃作为脱除NO的添加剂。

The slices were divided into two groups. In group I, the slices were perfused with 5-HT(subscript 2A) receptor excitomotory-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane dissolved in modified Kreb's solution. In group Ⅱ, the slices were perfused with ketanserine specific antagonist of 5-HT(subscript 2A) receptor. The effects of DOI and ketanserine on RRDA were observed.

标本分2组：第1组使用含5-HT(下标 2A)受体特异激动剂2，5-二甲氧基－4-碘苯基丙烷的Kreb's液灌流脑片，观察其对RRDA的影响；第2组使用含5-HT(下标 2A)受体特异拮抗剂酮舍林的Kreb's液灌流脑片，观察其对RRDA的影响。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷