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疫情告急，多国禁止粮食出口？对我国影响几何？
source link: https://tech.sina.com.cn/d/f/2020-03-29/doc-iimxyqwa3830574.shtml
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来源：中国科学报作者：李晨美国彭博社日前报道称，主要小麦面粉输出国哈萨克斯坦已经禁止出口小麦面粉、红萝卜、糖和马铃薯，越南暂停签署新的大米出口合约，塞尔维亚禁止出口葵花籽油等商品。俄罗斯也表示将每周评估情况，再决定是否实施出口禁令。与此同时
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