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【简答题】
写出电容率为ε=ε 0 ε r 的电介质中极化体电荷密度ρ p 和极化面电荷密度ρ pS 与电场强度 的关系式，并简要说明极化电荷密度与分布电荷密度的异同。
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【简答题】SDS-PAGE 电泳时,蛋白质样品的迁移速率只与样品自身的( )有关,与此相比,聚丙烯酰胺凝胶电泳还受到样品所带电荷数和( )的影响。
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A.
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B.
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D.
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