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【单选题】
一混合蛋白质溶液，其中各种蛋白质的pl分别为4．6、5．0、5．3、6．7、7．3，电泳时欲使3种蛋白质泳向正极，缓冲液的pH应为
A.
4．0
B.
5．0
C.
6．O
D.
7．0
E.
8．O
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