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chromatography
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利用混合物中各组分的物理化学性质（分子的形状和大小、分子极性、吸附力、分子亲和力及分配系数等）的不同使各组分以不同程度分布在固定相和流动相中，当流动相流过固定相时，各组分以不同的速度移动，从而达到分离的技术。
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social policy for the people with disability
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