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關注：1
2013-05-23 12:21
求翻譯：stratified sample that included all the opposed or cited patents in our 1993-1997 sample period and是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
stratified sample that included all the opposed or cited patents in our 1993-1997 sample period and
問題補充： |
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