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【单选题】
某一元弱酸溶液,当用同浓度的NaOH标准溶液滴定至一半时,溶液的pH值为4.36,则该一元弱酸的pKa= ( )
A.
4.36
B.
5.36
C.
3.36
D.
7.00
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参考答案:
举一反三
【简答题】根据下面英文,选择答案 Confucius(孔子) is the greatest teacher in Chinese history. He was born on September 28, 551BC(公元前) in the Kingdom of Lu, in today’s Shandong Province. When he was young, he and his mother h...
【单选题】This is the plane _______ he went to Shanghai ______ business.
A.
where, for a
B.
by which, on the
C.
in which, on
D.
where, on
【单选题】选举权与被选举权属于( )
A.
政治权利
B.
法律权利
C.
道德权利
D.
集体权利
【单选题】唯物辩证法与形而上学对立的实质在于是否承认
A.
对立统一学说
B.
质量互变规律
C.
否定之否定规律
D.
能动的革命的反映论
【单选题】He went to the garden and saw ________ one-year-old baby on the grass.
A.
a
B.
an
C.
some
D.
/
【单选题】(2012·辽宁)The newcomer went to the library the other day and searched for ________ he could find about Mark Twain.
A.
wherever
B.
however
C.
whatever
D.
whichever
【单选题】钢零件及钢部件矫正后,钢材表面不应有明显的凹面或损伤,划痕深度不得大于( )mm。
A.
0.2
B.
0.5
C.
0.7
D.
0.8
【简答题】Unit 1: Generation > Section C > Text Total Words: 1,407 Bricklayer's Boy My father and I were at college back in the mid-1970s. While I was in class at Columbia, he was on a bricklayer's scaffold not...
【简答题】改错。 (     )1. Did you enjoy you yesterday, my children ? ________ A           B      C                           D (     )2. He taught his son how mend bikes . ________ A      B          C            ...
【单选题】钢结构矫正后,钢材表面不应有明显的凹面或损伤,划痕深度不得大于0.5mm,且不应大于该钢材厚度允许负偏差的( )。
A.
4/5
B.
3/4
C.
2/3
D.
1/2
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