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【单选题】
在经济学中，短期和长期的划分标准为（ ）。A.
是否可以调整产量
B.
是否可以调整产品价格
C.
时间长短
D.
是否可以调整全部生产要素的数量
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【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】A．The mass production of steel caused a revolution in the industrial world. B．The mass production of steel caused a decline in the railroad industry. C．The mass production of steel caused an increase ...
【简答题】Tandem mass spectrometry
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