对宋代粮食亩产量的估计RT
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![对宋代粮食亩产量的估计RT](/uploads/image/z/9549414-54-4.jpg?t=%E5%AF%B9%E5%AE%8B%E4%BB%A3%E7%B2%AE%E9%A3%9F%E4%BA%A9%E4%BA%A7%E9%87%8F%E7%9A%84%E4%BC%B0%E8%AE%A1RT)
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