A waste-to-energy firm, for example, earns "gate fees" for taking the waste in the first place, as well as payments for the power it generates and any metals it recovers from the ash.
以废物能源公司为例,其首先赚取“门头费”,然后是为产生的能源收费,和在粉尘中的金属回收费。
3
The energy optimization methods in circuit level and gate level have been investigated widely.