以下哪项（）可作为管理水体富营养化的指标 Which of the following groups （) can be used as met
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以下哪项（）可作为管理水体富营养化的指标 Which of the following groups （) can be used as metrics to manage eutrophication of water body
A．酸性气体排放、大气氢离子浓度、酸性气体减排 Acid gas emissions, atmospheric hydrogen ion concentrations, reduction of acid gases
B．重金属排放、土壤重金属浓度、重金属废物回收量 Heavy metal emissions, heavy metal concentrations in soil, recovery of heavy metal scraps
C．氮排放量、水体内氮浓度、除氮设备投资 Nitrogen emissions, nitrogen concentration in water, investment on nitrogen removal equipment
D．大气温室气体浓度、能源消耗强度 GHGs emissions, atmospheric GHGs concentration, energy consumption in
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以上都可以