Coal maceral concentrates of high purity were prepared from four different rank coals by Density Gradient Centrifugation method.
经等密度梯度离心分离，从褐煤、长焰煤、气煤和贫煤四种不同变质程度煤中获得了高纯度的有机显微组分。
As technological research findings will be industrialization, we choose the sucrose density gradient centrifugation as purified method and study the postorder work of purified virus-containing fluids.
鉴于产品开发要求，试验研究确定选用蔗糖密度梯度离心方法作为流感疫苗的纯化手段。
As technological research findings will be industrialization, we choose the sucrose density gradient centrifugation as purified method and study the postorder work of purified virus-containing fluids.
鉴于产品开发要求，试验研究确定选用蔗糖密度梯度离心方法作为流感疫苗的纯化手段。
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