英德
有道
百度
谷歌
图片
维基
百科
沉淀分级
precipitation fractionation
- 并改进了逐步沉淀分级工艺，对PCS进行沉淀分级，得到了窄分布的分级样品。
And by improving the craftwork of precipitation of PCS, the narrow molecular weight distribution of PCS was got. - 本工作用甲苯作溶剂，乙醇作沉淀剂，用沉淀分级法，对溶聚丁苯橡胶（S-SBR）进行了分级。
Solution polymerized styrene-butadiene rubber ( S-SBR ) was fractionated by repeated precipitation method, using redistilled toluene as solvent and ethyl alcohol as precipitant. - 采用高浓度醇溶液处理羊栖菜粉、稀酸提取、减压浓缩、乙醇分级沉淀和冷冻干燥等单元操作，可以获得褐藻糖胶产品。
The fucoidan product was obtained by pretreatment of algae powder with high concentration ethanol, diluted acid extraction, concentration under vacuum, ethanol precipitation and lyophilization.
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