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 ...
我期盼的一件事就是在剑桥乘坐平底船畅游。The one thing I look forward to is going punting in Cambridge.我和内德极为深入地讨论了每一件事。Ned and I discussed everything to the nth degree.你必须仔细检查并多方核对你所听到的每一件事。You have to scrupulously check and cross-check eve...