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【单选题】
欲配制pH=9约为的缓冲溶液,下列缓冲对选择哪一对最合适?()。A.
- ；Ka2=6.23×
B.
HCN-NaCN ；Ka=4.93×
C.
NH3-NH4Cl；Kb=1.76×
D.
HAc-NaAc；Ka=1.76×
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A.
looking at
B.
finding
C.
waiting for
D.
looking for
【简答题】题目:____称为支路。
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【单选题】The actress looks very young but _____ she is more than forty years old. [ ]
A.
fortunately
B.
actually
C.
happily
D.
strangely
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