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求助!stata合并海关月度数据,已附上部分样本资料!
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------------------ copy up to and including the previous line ------------------
Listed 21 out of 641524 observations
. dataex v1 v13 v4 firm_name2000 in 52/91
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2019-1-27 16:45 - qinqinqiqi - Stata专版