Diacetone acrylamide ( DAAm ) was prepared by reacting acrylonitrile with diacetone alcoholammonia.以二丙酮醇和丙烯腈为原料,利用简便、温和的反应条件合成新型乙烯基功能单体-双丙酮丙烯酰胺.Crosslinkable acrylic polymer emulsion was obtained by adding acrylic polyme...
研究了一种无氰的高硅铝铸件的浸锌新工艺.A new non - cyanide zinking process for high - Si aluminum cast has been studied in this paper.本文介绍了PDS法焦炉煤气脱硫脱氰的应用研究情况.This paper describes the application and research of desulfurization and decya -...
I left eventually at six o'clock feeling utterly dispirited and depressed.我一直到6点才极度沮丧和郁闷地离去。The King, however dispirited, ploughs on.国王虽说沮丧，但仍一往无前。She looked tired and dispirited.她显得疲倦而且神情沮丧。...
These crystals are then embedded in a plastic, and the plastic is extruded as a wire...然后将这些晶体嵌入一块塑料，再把塑料挤压成线。The barbed wire had left only the tiniest nick just below my right eye.带刺铁丝网在我的右眼正下方只留了非常小的划痕。...learning to w...
大卫用的的弹弓和石弹杀死巨人歌利亚.David uses his sling and a stone to kill Goliath.射石炮早期发射石弹大炮的一种.An early form of cannon that fired stone balls.两个男孩把他们赢来的石弹平均分配了.The two boys divided the marbles they won fifty - fifty....
They plotted to make the whole Mississippi Valley secede from the United States.他们阴谋策划使整个密西西比流域脱离美国。We won’t allow Tibet to secede from China and become an independent nation.我们决不允许西藏脱离中国独立。But the southerners have lost ...