乙烯基

The different effect of support on trimerization catalyst activity was due to the hindrance of the ligand imposed to the active site, which might block off ethylene coupling, coordination, and insertion.

负载化对两种催化剂活性的影响程度不同，是由于R基为-C_(12)H_(25)时催化剂本身的位阻基团比较大，催化剂负载化加剧了位阻对乙烯配位、络合及插入的影响。

The combinative effect of the fluorine substitute and the bridging unit can make complex 2 as a highly active and selective catalyst for ethylene trimerization.

氟原子效应和桥碳原子上大取代基效应两者结合在一起，可以使络合物2成为一种高活性和高选择性的乙烯三聚催化剂。

The estrogenic activities and mutation effects of nonylphenol ethoxylates before and after microbial degradation were studied with the recombinant gene yeast and SOS/Umu test.

作者中文名：吴伟；吴滟；瞿建宏摘要：采用重组基因酵母和SOS/Umu试验研究了壬基酚聚氧乙烯醚(NP10EO)经生物降解前后的雌激素活性和致突变活性。

We designed new soluble poly(2,6-anthracene vinylene),and the structure and some properties were characterized by ~1H NMR, DSC and TGA and GPC.

本文以我们新近合成的2，6-二甲基蒽为起始原料，在国际上首次设计合成了可溶性的聚2，6-蒽基乙烯，对各中间体和目标聚合物进行了必要表征。

We anticipate the demand of formaldehyde will up to 2,930,000 tons, and 1,320,000 tons of methanol will be consumed;② At present, the acetic acid mainly produced by food zymotechnics or ethane in our country, along with the development of synthesizing acetic acid process with methanol, the demand of methanol will increase rapidly.

预计2010年甲醛需求量将达到293万吨，届时消费甲醇达132万吨；②目前我国醋酸生产多采用粮食发酵法或乙烯法，随着甲醇羰基合成醋酸工艺的发展，对甲醇的需求将迅速增加。

DU Self-Lubricating bushing made of triple layer composites material which consists of a steel backing,a sintered porous bronze partivles interlayer and calendared with PTFE and Pb mixture as surface layer.

嘉善倍研生产的SF-1无油润滑轴承/DU轴套，是以钢板为基体，中间烧结球形青铜粉，表面轧制聚四氟乙烯和铅的混合物，是卷制而成的滑动轴承。

Du self-lubricating bushing made of triple layer composites material which consists of a steel backing,a sintered porous bronze partivles interlayer and calendared with ptfe and pb mixture as surface layer.

精工轴承倍研生产的sf-1无油润滑轴承/du轴套，是以钢板为基体，中间烧结球形青铜粉，表面轧制聚四氟乙烯和铅的混合物，是卷制而成的滑动轴承。

DU Self-Lubricating bushing made of triple layer composites material which consists of a steel backing,a sintered porous bronze partivles interlayer and calendared with PTFE and Pb mixture as surface layer.

SF-1无油润滑轴承，是以钢板为基体，中间烧结球形青铜粉，表面轧制聚四氟乙烯和铅的混合物，是卷制而成的滑动轴承。它具有摩擦系数小，耐磨、抗腐蚀性好和无油润滑的特点。

DU Self-Lubricating bushing made of triple layer composites material which consists of a steel backing,a sintered porous bronze partivles interlayer and calendared with PTFE and Pb mixture as surface layer.

SF-1无油润滑轴承/DU轴套，是以钢板为基体，中间烧结球形青铜粉，表面轧制聚四氟乙烯和铅的混合物，是卷制而成的滑动轴承。它具有摩擦系数小，耐磨、抗腐蚀性好和无油润滑的特点。

Y9 T9 W! i3 u5 ~/ G DU Self-Lubricating bushing made of triple layer composites material which consists of a steel backing,a sintered porous bronze partivles interlayer and calendared with PTFE and Pb mixture as surface layer.

轴承， 自润滑，知识5 w， B0 H3 C0 E# D；}9 T8 X SF-1无油润滑轴承，是以钢板为基体，中间烧结球形青铜粉，表面轧制聚四氟乙烯和铅的混合物，是卷制而成的滑动轴承。它具有摩擦系数小，耐磨、抗腐蚀性好和无油润滑的特点。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。