产业系统的生态效率可采用以下哪项（）进行评价 Which of the following can be used to evaluate
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产业系统的生态效率可采用以下哪项（）进行评价 Which of the following can be used to evaluate the eco-efficiency of an industrial system（）
A．系统服务量与环境负荷之比 The ratio of service volume to its related environmental load
B．环境负荷与系统服务量之比 The ratio of environmental load to the related service volume
C．系统产品量与系统服务量之比 The ratio of product output to its service volume
D．系统服务量与系统产品量之比 The ratio of service volume to its product output
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