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...
As the nation continued to mourn, the new President of South Africa paid his own tribute.举国仍在哀悼之际，南非新任总统也表达了自己的怀念之情。Blessed are they that mourn, for they -- they -- "有福的人是那些哀恸的人, 因为他们 —— 他们 —— ”We mourn over the child�...
CONCLUSION Adenotonsillectomy or adenoidectomy is effective in treatment of children adenoidal hypertrophy with OSAHS.结论儿童OSAHS手术治疗有助于改善儿童的短时记忆.Methods: 32 patients with adenoidal hypertrophy were treated by radiofrequen...
Barry had his nose put out of joint by Lucy's aloof sophistication.露西的冷淡与世故使得巴里十分不快。They had come to the world's most famous pick-up joint.他们来到了全世界最有名的寻花问柳之地。Many remedies effective in joint disease are primari...