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farming system
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farming system
Encyclopedia
农学
农作制度
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farming system
农作制度
一个区域或生产经营单位对自然、生物、社会经济等各类农业要素进行总体安排,从系统角度研究农业生产与自然环境及人工环境关系,以及农业系统中种、养、加及农、林、牧产业协调发展的综合技术体系。
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powder metallurgy friction materials
powder metallurgy iron-based products
powder metallurgy magnetic materials
powder metallurgy material
powder metallurgy materials with surper-fine crystalline structure
powder metallurgy mechanical parts
powder metallurgy of metal matrix composites
powder metallurgy porous materials
powder metallurgy refractory metal materials
powder-metallurgy sand screen
powder metallurgy science
powder metallurgy superalloy
powder metallurgy superalloys
powder metallurgy sweating materials
powder metallurgy titanium alloys
powder metallurgy titanium aluminide
powder method
powder mildew of rubber tree
powder mold compaction
powder packing textiles
powder pattern
powder preparation by mechanical alloying
powder preparation by precursors method
powder preparation by self–propagation high–temperature synthesis method
powder preparation of crude drugs
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