不要忘了给食素者准备沙拉.Don't forget the salads for the vegetarians!对称机制无法解释这个结果, 因为我们给食的对象每次都不一样.Symmetrical connections could not explain this outcome, as the pattern varied from day to day....
Polyether - type isocyanate prepolymers are prepared with polyether polyols and tolylene diisocyanate.采用聚醚多元醇和甲苯二异氰酸酯合成了聚醚型异氰酸酯预聚体.A polyamide imide was synthesized from trimellitic anhydride and di isocyanate.本文用偏苯三酸酐和二...