聚羟基乙酸的经典制备方法主要有两种:直接缩合聚合法和乙交酯开环聚合法. There are two means available for the preparation of PGA - synthesis polymerization and ring - opening polymerization.
部署在欧洲水域之外的战舰数量差不多增加了一倍。The number of warships stationed outside European waters roughly doubled.这个小男孩喜欢做战舰模型.The little boy enjoys making battleship models.一艘新战舰从船坞下水.A new battleship was launched from a shipyard....
曲线刃滚切刀是用来加工护翼卫生巾的专用刀具.The curve - edged hobbing cutter is used in producing rectangular wing sanitary napkin.姐姐只使用这个牌子的卫生巾,从来不用其他牌子的.My sister only uses this brand of sanitary towel.每一位女性都离不开卫生巾的呵护.Each females are cares...
Purchase tax was not payable on goods for export.出口商品不需要交购买税。The tax increase sounded the death knell for the business.税赋的增加为这个企业敲响了丧钟。Is a tax increase still out of the question?增加税收仍然是不可能的事吗？...
Except for the transitional elements, valency electrons are in the outermost electron shell.除去过渡元素外, 价电子位于最外面的电子层.Transitional metals ( Fe 3 + ) play an extremely important role in catalyzing CLA oxidation.变价金属离子 ( Fe~(3...
Esophageal varix ligation under endoscope ( EVL ) is a safe and effective treatment for esophageal varices.内镜下食管曲张静脉结扎是一种安全有效的新方法.Each group was narcotized routinely, turn - on the chest and coronary artery ligation.毛冬青甲...
She procrastinated her return.她拖延了归期.He procrastinated until it was too late to do anything at all.他因循坐误,一事无成.He procrastinated the matter until it was almost too late.他把事情耽搁了,最终太迟了....