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qin bei shang xu nan xia , rang cao yuan he nong qu shuang ying ( shang )
Author(s): 
Pages: 23
Year: Issue:  10
Journal: Knowledge is Power

Abstract: 中国广袤的大地丰富、多样,生产、生活也是依地理生态变化而不同,天苍苍野茫茫的西北高原草原蓄养着游牧民族的牲畜,华北、东北平原及东南则以粮食和禽类的生产养育着农业民族.然而,曾经支撑中国畜牧业大厦主体的草原出现了生态危机,给现代农村生活带来了新的令人烦恼的问题.……
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