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关注：1
2013-05-23 12:21
求翻译：The average ratio of R&D stock to assets is 0.169. The same prac-tice was applied for patents and citations. For less than a quarter of all observations, no是什么意思？ 待解决
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The average ratio of R&D stock to assets is 0.169. The same prac-tice was applied for patents and citations. For less than a quarter of all observations, no
问题补充： |
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