采用1,4- 丁二醇 、 马来酸酐及十八醇为主要原料,合成出一种双子表面活性剂1, 4- 丁二醇双琥珀酸十八醇双酯磺酸钠.A new type gemini surfactant was synthesized from 1,4 - butanediol , maleic anhydride and 1 - octadecanol.研究了加入聚对苯二甲酸丁二醇酯(PBT) 对酚醛塑料的增韧改性.A phenolic resin was ...
The proliferation of media choices , especially the Internet, threaten to cannibalize both readership and prestige.随着越来越多的媒体出现在人们面前, 尤其是随着因特网的发展, 报纸的读者群及影响面都有不同程度的下降.What's the target readership of this paper?这份报纸以哪...
For speed we used packets of pizza dough mix...为了节约时间，我们用了几包做比萨饼的混合面粉。John advised Peter to get out and mix more with people.约翰劝彼得出去参加社交活动, 多跟人们往来。You can mix blue and yellow paint to make green one.你可以把蓝色和黄色油漆混合成绿色。Mix ...