条件筛选
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After the corn subsidy policy was introduced, the rise in corn prices is still not obvious
The corn subsidy policy is here. Will corn prices launch a second upward attack? Seeing this question actually made me reflect on another issue: recently there has been a steady stream of positive news for the corn market, but corn prices still have not risen! Although here there is no...
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Who first introduced the concept of the ideal protein model for pigs, and when?
When and by whom was the concept of the ideal protein model for pigs first introduced?