The room had a great bay window.这间房有一扇巨大的凸窗。The front bay window is rotten.前面的凸窗腐朽了。A projecting bay window , supported from below with a corbel or bracket.一种椭圆形或是圆形的凸肚窗....
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 ...