提出持续时问为 40-60 年长波周期的是( )
A.约瑟夫·基钦
B.克莱蒙特·朱格拉
C.库兹涅茨
D.康德拉季耶夫
正确答案是D
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Many people believe thatbeavers are intelligent animals. After all,their dams are fine examples of engineering. The engineering featsof beavers are well known, but it will be useful to recall t
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