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【单选题】
下列溶液中不能组成缓冲溶液的是:A.
NH 3 × H 2 O － NH 4 Cl
B.
H 2 PO 4 - － HPO 4 2-
C.
NH 3 × H 2 O+ 过量 HCl
D.
HCl+ 过量 NH 3 × H 2 O
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