The results showed that Yb ( OSO 2 C 8 F 17 ) 3 and C 10 F 18 were the best catalyst and fluorous solvent respec - tively.研究表明Yb ( OSO2C8F17 ) 3和C10F18分别是最好的氟代催化剂和氟溶剂.The FBC ( fluorous biphase catalysis ) is a new nonaq...
The US military wants to avoid the graduated escalation that marked the Vietnam War.美国军方希望避免出现类似于越南战争那样逐步升级的态势。Escalation has conceptual affinities with bargaining theory.逐步升级同交易理论在概念上具有相似性.Any unexpected circumstance th...
These costs may be counterbalanced by the advantages of simplified fabrication, erection, and added aesthetics.这些开销可由简化制造与安装及增添美观等优点来补偿.The erection of this framework took only a few minutes.架设这个框架只需几分钟.Its lower end is ...