Situations of preparing isocyanate trimers at home and abroad are mainly introduced.主要介绍国内外异氰酸酯三聚体的制备状况.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...
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...
他们经过时，响起了令人哀怜的恸哭。As they pass by, a piteous wailing is heard.他仰天恸哭起来。He tossed back his head and keened.母亲恸哭死在战争中的儿子.The mother was crying over her son killed in the war....
an area with a high incidence of crime犯罪率高的地区This area has a high incidence of crime, disease, unemployment, etc.这个地区的犯罪率 、 发病率 、 失业率等很高.The report analyses the incidence of cancer among people aged 0 - 24.这份报告分析了从0 岁 到2...