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山东省冬小麦-夏玉米轮作体系土壤氮素盈余指标体系的构建与评价——以德州市为例
山东省冬小麦-夏玉米轮作体系土壤氮素盈余指标体系的构建与评价——以德州市为例
2019
liuhongyuan
zhangaiping
Shiqi Yang
Lei Xing
Zhengli Yang
Keywords:
Combinatorics
Euclidean distance
Mathematics
index system
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