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【单选题】
某化合物反应时,起始浓度为 1 mol • dm -3 , 1 h 后为 0.5 mol • dm -3 , 2 h 后为 0.25 mol • dm -3 ,则此反应的级数为A.
0
B.
1
C.
2
D.
3
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举一反三
【单选题】By aggregating and charting visits to the antidepressants sites, the author intends to ______.
A.
expound the reason why the spike in traffic to those sites takes place in late October
B.
verify the conclusion about when the peak of 'depression' is
C.
make a comparison between the different conclusions reached in Paragraph 2 and 3
D.
state the fact that people can anticipate their holiday depression
【简答题】It is tested ineffective that if a person with depression frequently visits doctor but without ______ in symptoms.
【简答题】Google counters that DoubleClick s own information about who visits their sites and ____________.
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