水熱條件決定了東北單產低於南方。地廣人稀才是糧食自足率高的原因。市場經濟決定了東北適合農業，就像烏克蘭是歐洲糧倉。但是

來源: 十具於 2025-02-08 12:37:12 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.