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 ...
Prices have been cut by developers anxious to offload unsold apartments.急于脱手未售出公寓的开发商降低了房价。The brochure offers a wide choice of hotels, apartments and holiday homes.这本小册子提供了很多宾馆、公寓、度假屋供选择。"Oh, those new apartments are re...