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【单选题】
谷氨酸的Pk1=2.19(a-COOH)、pk2=9.67(a-NH3)、pk3=4.25(g-COOH) pl=( )A.
1/2*（2.19+9.67）
B.
1/2*（9.67+4.25）
C.
1/2*(2.19+4.25)
D.
1/3*(2.19+4.25+9.67)
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