单选题
1分
A lower fuel consumption translates to reduced carbon dioxide emission since the amount produced is ...
A lower fuel consumption translates to reduced carbon dioxide emission since the amount produced is directly proportional to______and therefore to the engine or plant efficiency.
参考答案: D
参考解析: 注:低的燃油消耗说明减少二氧化碳排放,因为产生的二氧化碳量直接与发动机功率成正比,因此也与发动机或装置的效率成正比。