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...
The armed forces were on high alert to guard against any retaliation.武装部队保持高度戒备，以防发生任何报复行动。The bank is alert to the danger.银行充分意识到了危险。All the Plymouth hospitals are on red alert.普利茅斯所有的医院都处于紧急状态之中。...