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...
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...
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...
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....