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【单选题】
由总浓度一定的H2PO42-¾HPO42-缓冲对组成的缓冲溶液，其有效的pH缓冲范围是（）。{H3PO4的Kθa1 = 7.5 ´10-3，Kθa2= 6.2 ´10-8，Kθa3 = 2.2 ´10-13}A.
4.6 ± 1
B.
2.1 ± 1
C.
12.2 ± 1
D.
7.2 ± 1
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【单选题】The sporting events in the YOG are open to athletes aged _____________.
A.
10-14
B.
15-18
C.
16-28
D.
21-25
【单选题】With a lot of homework _________, Tom didn’t go to the movies with his father.
A.
finished
B.
to finish
C.
finishing
D.
being finished
【单选题】The motto for Nanjing 2014 YOG is _____________.
A.
Excellence, friendship, respect
B.
Faster, Higher, Stronger
C.
Olympics for young people, by young people
D.
Reliable, safe, risk-free city
【单选题】Compared with the Olympic Games, the YOG is special in that __________.
A.
it is not about competition
B.
it will spread the Olympic values
C.
there will be more cultural and educational events
D.
there will be more business opportunities for the youth market
【简答题】苏教版一年级上册语文补充习题j q x答案
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