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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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cyclic covering space
cyclic crossed product
cyclic cumulative causality theory
cyclic curve
cyclic cut
cyclic decomposition
cyclic deformation
cyclic design
cyclic determinant
cyclic determinants
cyclic difference set
cyclic displacement
cyclic double-sweep
cyclic electron flow
cyclic electron transport
cyclic element
cyclic enzymatic amplification method
cyclic equation
cyclic extension
cyclic extension field
cyclic extension group
cyclic extension of a group
cyclic factor set
cyclic field
cyclic form
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