The result shows that the bubble is an important factor influencing coal separation, and the variation of its volume fraction is closely related to the variation of density of ADMFB.
结果表明：气泡是影响分选精度的重要因素，其体积分率的变化与床层密度波动密切相关。
In the case of large density difference, there is a velocity separation between different media, making the measurement more difficult, cross-correlation method is still usable.
在密度差别较大时，存在着不同介质间的速度分离，给相关法测量带来困难。
The green leaves of vegetables through tissue homogenate, differential centrifugation separation, density gradient centrifugation purify sample of chloroplast.
对蔬菜绿叶通过组织匀浆，差速离心分离，密度梯度离心分离、纯化、提取叶绿体。
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