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营养物基准
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营养物基准
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大气污染物环境基准
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nutrient criteria
营养物基准
水体中产生的生态效应不危及其功能或用途的营养物浓度或水平。可以反映受到人类开发活动影响程度最小的地表水体营养状态。主要指地表水体中浮游藻类生物不产生过量生长现象(水华现象),不致危害该水生态系统结构或功能的水体中营养物质的安全阈值。
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agricultural rodent control
Agricultural Rodent Pests in Southwest China
agricultural scale operation
agricultural science and technology
agricultural science and technology achievements
agricultural science and technology extension organization
agricultural science and technology extension system
agricultural science and technology innovation system
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agricultural scientific research system
agricultural socialized service organization
agricultural soil and water resources utilization
agricultural soil environmental survey
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agricultural specialization
agricultural specialization management
agricultural stable isotope tracer technique
agricultural standardization policy
agricultural statistical reporting system
agricultural statistics
agricultural strategic structural adjustment policy
agricultural structure policy
agricultural subsidy policy
agricultural super docking
agricultural supply chain
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