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【单选题】
A data set that consists of observations on a variable or several variables over time is called a _____ data set.A.
binary
B.
cross-sectional
C.
time series
D.
experimental
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举一反三
【单选题】Which is the feature of “mass cooperation networks”?
A.
Mass cooperation networks were based on mutual trust
B.
Most mass cooperation networks were linked with oppression and exploitation.
C.
Mass cooperation networks quickened the pace of agricultural revolution.
【简答题】Tandem mass spectrometry
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