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【单选题】
已知吡啶的 K b =1.7 × 10 -9 ,其共轭酸的 K a :A.
1. 7 ×10 - 9
B.
5.9 × 10 -6
C.
1. 7 ×10 - 5
D.
5.9 × 10 - 9
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