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【单选题】
某一酸碱指示剂的pKIn=3.4，它的变色A.
2. 4 ~ 3. 4
B.
2. 4 ~4. 4
C.
4. 4 ~ 6. 2
D.
6. 2 ~ 7. 6
E.
1. 9 ~ 4. 9
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