水热条件决定了东北单产低于南方。地广人稀才是粮食自足率高的原因。市场经济决定了东北适合农业，就像乌克兰是欧洲粮仓。但是

来源: 十具于 2025-02-08 12:37:12 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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