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【单选题】
同一时间,不同单位相同指标组成的观测数据称为A.
原始数据
B.
截面数据
C.
时间序列数据
D.
数据
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【单选题】—Which of those electronic dictionaries do you like most? — _____. They are both expensive and of little use. [ ]
A.
Both
B.
None
C.
Neither
D.
All
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