A polyamide imide was synthesized from trimellitic anhydride and di isocyanate.本文用偏苯三酸酐和二异氰酸酯合成了一种新型聚酰胺酰亚胺.The paper introduces the product of class H polyester - imide solventless impregnating varnish.本文介绍一种不饱和聚酯亚胺类型的H级...
分析了熔炼电炉钢制造的铝型材热挤压模的失效原因及影响因素.The causes of lose effectiveness of aluminum profile hot extrusion die made - smelted steel are analyzed.按冶炼方法,钢可分为 平炉 钢 、 转炉钢和电炉钢.By refining methods steels can be divided open - hearth furn...
沉闷、明显不友好和冷淡的场面多次出现。There were periods of sulking, of pronounced distance, of coldness.房间里一片冷淡的气氛。There was a frigid atmosphere in the room.他受到冷淡的接待.He was given a dry reception....