以下哪一指标( )可用作某系统的环境负荷 Which of the following indicators can be treated as the environmental loads of a system( )
A、单位服务的温室气体排放量 The greenhouse gas emissions per unit of service B、温室气体排放量 The greenhouse gas emissions C、单位产品的矿产资源消耗量 The mineral resources consumption per unit of products D、产品产量 Production of products