The latex concentration is raised by evaporation or centrifugation.通过挥发或离心作用提高胶乳的浓度.The results of the tests indicated that latex and polyurethane foam mattresses burned fastest.试验结果表明,天然乳胶和聚氨基甲酸乙酯泡沫床垫燃烧得最快.Leather and l...
正式确立合作关系将会促进共和国之间合作的顺利进展。The formalization of co-operation between the republics would produce progress.激光影碟相对于磁带的技术优势早已牢牢确立。The technical superiority of laser discs over tape is well established.两位以前的客户的推荐有助于确立她的诚信度.Rec...
You can leave a message on our answering machine.您可以在我们的答录机上留言。She was punished by teachers for answering back.她由于顶嘴而受到了老师的惩罚。I called several times, but only got the answering machine.我打了几次电话，但只有电话答录机答话。...
N - hydroxyethylpyrrolidone ( NHP ) was synthesized from � � - butyrolactone and ethanolamine on Y molecular sieve catalyst by two steps.以改性Y分子筛为催化剂,γ-丁内酯和乙醇胺为原料,采用γ - 丁内酯法两步合成N - 羟乙基吡咯烷酮 ( NHP ).Surface active propertie...