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【单选题】
有一混合蛋白质溶液,各种蛋白质的PI分别是3.3、5.0、5.4 、6.5,电泳时欲使其都向正极,缓冲溶液的PH应该是
A.
3
B.
4
C.
8
D.
5
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shoes, clothe, toys
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【单选题】This department store has , and . [ ]
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【单选题】I want _______a pen _______$4.
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