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。
Coal maceral concentrates of high purity were prepared from four different rank coals by Density Gradient Centrifugation method.
结论：利用密度梯度离心和贴壁筛选的方法可以分离hmsc，联合应用免疫细胞化学、细胞化学和电镜等技术手段鉴定HMSC的方法有效。
Conclusion The HMSC can be isolated with density-grad centrifugal and anchoring screening. The method to identify HMSC with immunocytochemistry, cytochemistry and electron microscopy is effective.
通过密度差、沉降分离等方法对原油进行脱水。
Adopted are such methods as density difference and settlement separation to dehydrate such crude oil.
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