题目内容

在图19—2中，经济在何时经历经济衰退？

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what chemicals did you use to treat the boiler water ？when you test alkalinity and acidity of water in boiler by pH test paper ？ the result shows the boiler water is in acidiity . please describe what the possible cause is .

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A. I +II
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自1854年以来，NBER已经确认了________。

A. 82个完整的经济周期
B. 33次经济增长和25次经济衰退
C. 33个完整的经济周期
D. 25次经济增长和33次经济衰退
E. 17个完整的经济周期