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【单选题】
用NaOH溶液滴定某弱酸HA,若两者浓度相同,当滴定至50%时溶液pH = 5.00; 当滴定至100%时溶液pH = 8.00;当滴定至200%时溶液pH = 12.00,则该酸pKa值是A.
5
B.
8
C.
12
D.
7
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A.
playing
B.
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C.
to play
D.
plays
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A.
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B.
埃德加·斯诺
C.
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D.
霍尔丹
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A.
student
B.
basketball player
C.
baseball pl ayer
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【单选题】Wang Fang is of the five basketball players, but she plays very well. [ ]
A.
thinner
B.
thinnest
C.
the thinnest
D.
very thin
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