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songjiwen: 仔细认真的学习了一遍,感到很有收获,你高屋建瓴,全面分析了新型肥料推广应用中的问题。但是感觉你涉及的面太宽,虽然条理很清楚,但有点太粗,不深不透,大多是泛泛而谈。 对不起,我有点不自量力, .. (2013-06-25 16:00)
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